first eight rings, the superior pinnae only are developed, and are provided with 

 long lanceolated setae ; those of the third pair, however, have a fasciculus of 

 stout black truncated setae at their bases. Inferior pinnae first appearing on the 

 ninth ring, and provided with short uncinate setae, which have each six or eight 

 uncina3, occupjdng the whole length of their edges. Dorsal pinnae of the tenth 

 ring expanded into wing-like lobes ; ventral pinnae united into a transverse disc, 

 as is also the case on the Uth, 12th and 13th. In the 11th — 15th rings the dor- 

 sal pinnae are united to form sacs, of which those of the 14th and 15th are much 

 the smallest, and compressed above ; the ventral shields of these two rings are 

 compressed, bilobate, and protruded so as to lose the disc-like form. Dorsal 

 pinuce of the 16th and succeeding rings large and finger-shaped, with capillary 

 setae ; — posteriorly they grow more slender but not much shorter. In these 

 rings the ventral pinnse form four lobes. Length 2 inches. Found in the cir- 

 cumlittoral zone. 

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



34. Chcetopteeus luteus. Long and slender, cylindrical, of nearly the same 

 thickness throughout ; color lemon-yellow. Tube thin, membranous within, 

 exteriorly composed of mud. Rings about forty in number. Yentral shields of 

 the 14th and 15th rings disc-like as in the others ; those of the posterior rings 

 with the two middle lobes only developed. Dorsal pinnae of the posterior rings 

 full and lobe-like at the base, but suddenly tapering into a long sheath for their 

 few capillary setae. Length three inches. Found abundantly on muddy bot- 

 toms in the circumlittoral zone. 



^Hab. Australia, at Port Jackson. 



35. CiRRATULUS AusTRALis. Large, rounded above, and flattened below, pos- 

 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 wanting on some of the rings. Setse 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, 0.45 inch. Found in the circumlittoral zone. 



Hah. Cape of Good Hope, False Bay. 



36. Glycera Kraussii. Of alight flesh color, composed of about 100 closely- 

 set 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 pinnas. j'he 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. Nephthys longipes. Body somewhat depressed, of a bluish-white color 

 narrow in comparison with the length of the pinnas 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 setas 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, O.IG 

 inch. In sand at low-water mark. 



Hab. Australia, at Botany Bay, 



