. Bulletin du Museum of Comparative Zoology de Harvard College. Zoologie. L'EUROPE : NÉMERTES DES CÔTES OUEST ET NORD-OUEST. 291. Fig. 58.- Tet.rastemma rifrons de ni- (/. Mandrins Central et Ijases opacjue, montrant plus de portions postérieures. étant souvent moins d'un tiers plus large que la tête. Le marquage est parfaitement triangulaires, avec son sommet pointu dans la ligne médiane en avant. Corps brun pâle, chamois, profond de la chair, ou parfois blanchâtre avec une légère teinte de brun. Plus pâle ou blanchâtres, une ligne, s'étend souvent longitudinalement sur surface dorsale à l'extrémité postérieure du corps ; ven- tral chamois pâle de surface ou g

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 291. Fig. 58.— Tet.rastemma ni- (/rifrons. Central stylets and Ijases, showing more opacjue posterior portions. being often less than one third as wide as head. The marking is acutely triangular, with its pointed apex in the median line anteriorly. Body pale brownish, buff, deep flesh color, or occasionally whitish with a faint tinge of brown. A paler, or whitish, line often extends longitudinally on dorsal surface to posterior end of body; ven- tral surface pale buff or grayish throughout. The red blood vessels are naturally more con- spicuous than in the darker varieties. Othei; varieties are reddish brown, thickly sprinkled with minute dots of darker color on dorsal surface; ventral side of head white, with white median band extending posteri- orly as far as intestinal region ; rest of ven- tral surface reddish brown. Other specimens are brick red in esophageal region and chest- nut brown posteriorly, with ventral surface grayish or pale reddish. In fact, there are all possible gradations between the most extreme color vaiieties, but all agree in having the cephalic mark- ing dark l)rovn in color. Pigment to which color of body is due resides in in- tegument, except that of the cephalic marking, which is placed deep among tissues of the head. Integument and pigment often sloughed off before death, leaving the body pinkish or flesh color, with the ocelli and red. blood vessels showing very conspic- uously. General color of hodj is retained after preservation, and the cephalic marking is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum

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