392 [July, 



teriorly tapering. Head obtuse, eyes none; neck with two crowded clusters of 

 filaments, one on each side of the back at the fourth segment; body with a se- 

 ries of filaments along each side, one to each ring; which, however, are in most 

 specimens wantiog on some of the rings. Setae in two rows on each side ; the 

 superior ones capillary ; the inferior ones (except anteriorly) short, stout and 

 arranged three in number to each ramus. Color greenish or reddish-brown. 

 Length, 9 inches ; breadth, 45 inch. Found in the circumlittoral zone. 

 Hab. Ope of Good Hope, False Bay. 



36. Glycera Krai/ssii. Of a light flesh color, composed of about 100 closely- 

 eet rings, at the 10th of which the breadth is greatest. Head subtriangular, 

 with 16 segments; terminal tentacula scarcely perceptible. Proboscis smooth, in 

 length one-fourth that of the body ; teeth small, much curved. Pinnae quadri- 

 lobate ; the few superior setae capillary ; the inferior ones very numerous and 

 falcate. Inferior cirrus large, lobe-like, placed close to the pinnae ; superior cir- 

 rus placed on the side of the body, remote from the pinnae. The branchial 

 tonguelet was retracted in the specimen examined. Length, 2 inches. Found 

 in the circumlittoral zone, on sandy bottoms. 



Hab. Cape of Good Hope, at Simon's Bay. 



37. Nkphthys longipes. Body somewhat depressed, of a bluish-white color, 

 narrow in comparison with the length of the pinnae which project to a distance 

 equalling its width, on each side. Rings about eighty in number. Tentacula 

 small, placed rather near the base of the head, two on each side. Proboscis 

 with the terminal cirri short, the lateral ones large, curving backward, and co- 

 vering the anterior half of the organ, in eight circular approximated rows. 

 Pinnae large ; their membranous leaflets very narrow ; the setae capillary, of 

 great length, and equal in number in the superior and inferior pinnae. Branchial 

 tonguelet large, much curved ; often with a smaller one placed close to it on the 

 superior pinnae. Length, 3 inches; breadth, 0.42; of the body alone, 0.16 

 inch. In sand at low-watermark. 



Hab. Australia, at Botany Bay. 



38. Lysidice robusta. Body much thicker than is usual in the genus ; very 

 convex above, and flat below ; of a copper color. Rings very closely-set, about 

 one hundred and twenty in number. Head concealed, but provided with three 

 conspicuous, tri-articulate tentacula, and with two large rounded lobes below. 

 Proboscis very short ; jaws very strong, calcareous externally, corneous within. 

 Neck equalling the succeeding two rings together in size. Pinnae very small ; 

 superior cirrus large, inferior one short; superior setae capillary, lanceolated but 

 tapering to a long hair-like extremity ; inferior ones falcate with short smooth 

 terminal joints; acicle blunt, of a dark-brown color. Length, 2.8 inches; 

 breadth, 0.15 inch. Found under stones near low-water mark. 



Hub. Australia, at Port Jackson. 



39. Nereis mendax, Small, rather slender, largest anteriorly, flattened pos- 

 teriorly. Head elongated, narrow, with the terminal tentacles well developed 

 and extending somewhat beyond the thick inferior ones ; tentacula cirri very 

 slender, variable in length, but usually reaching beyond the tentacles ; eyes very 

 conspicuous, the posterior ones largest and nearest to each other. Pinnae rather 

 large, anterior ones with pointed lingulae, and dorsal and ventral cirri ; in the 

 posterior pinnae the superior lingula loses its cirrus, and expands into a broad 

 lamella. Color variable ; pale red, or brownish, often farinaceous posteriorly ; 

 always with a dorsal line of flake-white, and a white spot between the eyes. 

 Length, 1.5 inches; breadth, 0.2 inch. It inhabits a tube. Common in the 

 circumlittoral zone. 



Hab. Cape of Good Hope, at False Bay. 



40. Nereis operta. Large, of an uniform dark sepia color above, paler be- 

 low and posteriorly. Head short, eyes nearly hidden under the integument ; in- 

 ferior tentacles extending beyond the others. Anterior pinnae with blunt lin- 



