OBTAINED DURING THE CRUISE OF H.M.S. 'VALOROUS.' 505 



Ophelia limacina, H. E. Station 4, 20 fathoms, in shell-sand. Of good size, but 

 not larger than at St. Andrews. 



Tachttrypanb Jepfreysii, n. sp. (PI. LXV. fig. 10). Station 9, 59° 10' N., 50° 25' W., 

 1750 fathoms, on a bottom of mud. The body of this species is elongate, being upwards 

 of 2 inches long in spirit and about yq of an inch in breadth, rounded in front, but marked 

 by the usual ventral ridges throughout the rest of its extent. There are about thirty 

 segments, besides the first and last, the anterior being short, those in the middle very 

 long. The head forms a short cone, with a minute filiform process at the tip. No 

 bristles are "visible under a lens, the body being smooth and iridescent, like that of Lino- 

 trypane apogon, for the fine transverse lines are not conspicuous ; very minute simple 

 bristles are, however, present. There are no cirri. The last caudal segment is separated 

 by a well-marked furrow from the rest of the body, and terminates in a slender recurved 

 process bent downward and forward. In the structure of the body-wall Tachytrypane 

 Jeffreysii forms an intermediate link between Linotrypane and the other forms, con- 

 necting both with Ammotrypane and Ophelia. The cuticle (fig. 11) is greatly thickened 

 (as in Linotrypane), and a special process passes inward from the median line on the 

 ventral surface toward the nerve-cords ; it is further marked by fine cross striae. Prom 

 each side of the nerve-trunks the oblique muscle proceeds to the body-wall, and cuts off a 

 segment of the longitudinal muscular layer. The intestinal canal is filled with Globi- 

 gerina-muA. 



Ammotrypanella arctica, n. sp. Station 16, 1785 fathoms, on Globigerina-ooze. 

 A somewhat small form, measuring about f of an inch long, and more slender than a 

 young Ammotrypane aulogaster of the same length, while the contour is different. The 

 cephalic lobe (PL LXV. fig. 12) especially diverges, being bluntly rounded, and furnished, 

 on each side of the base dorsally, with a considerable pigment-speck. The succeeding 

 segments are somewhat narrow, as in allied forms (e. g. Ammotrypane), and each has a 

 tuft of simple silky bristles, which, in a dorsal view (as in fig. 12), project prominently 

 outward and backward in the first seven or eight segments. The following twelve or 

 thirteen segments are larger, but their bristle-tufts are minute, and being sunk in the 

 groove opposite the attachment of the oblique muscle, do not show laterally in ordinary 

 views. Toward the posterior end the bristles again become somewhat more distinct, and 

 slender cirri still remain on several feet. The caudal segments are short, and the last is 

 funnel-shaped and terminates in a smooth rim. The ventral sulcus commences anteriorly 

 at the buccal orifice, and is well marked in front of the caudal process. The cuticle is 

 dense. The condition of the specimen is unfavourable for minute work. The total 

 number of segments seems to be about thirty. 



A still more minute example comes from the same station. It presents no cirri; 

 but the state of the specimen (which appears to have been dried) is unfavourable for 

 the preservation of such organs. A papilla, considerably larger than in A. aulogaster, 

 exists at the tip of the snout. The bristles are long in front of the caudal process, 

 which is cylindrical and appears to have an even rim. This may be an injured young 

 example of A. aulogaster, though the snout and contour differ. 



