488 PROCEEDINGS OF THE NATIONAL MUSEUM vol.99 



throughout the length of the presiphonal segment of intestine ; length 

 100 mm. ; thickness 15-18 mm. 



Description. — The body is cylindrical, abruptly tapered and blunt 

 at both ends. The skin is covered all over with closely placed elevated 

 irregular glands of several sizes, spaced less than the diameter of the 

 largest. They are larger at the ends of body but are perfectly visible 

 to the naked eye all over the surface and there is no smooth area 

 anywhere. Between the glands the skin is finely wrinkled trans- 

 versely. The glands were more prominent when the specimen was in 

 formalin than when subsequently preserved in alcohol. Only the 

 basal 18 mm. of the proboscis remains. The margin joins at the base 

 as in calif ornicus to form the lower lip, and the concave surface is 

 reddish brown. 



Setae two, strong, terminally evenly curved, and only about 5 mm. 

 behind mouth. There is an interbasal muscle that passes through the 

 neurointestinal blood vessel. 



Nephridia two, longer than the preserved specimen and filled with 

 eggs (May 22). The nephrostome has the characteristic expanded 

 lip with a lobed or shallowly laciniate border and is about 4 mm. 

 long, but in life is probably longer. 



The anal vesicles are unequal in size; probably the inequality is 

 abnormal. The ciliated funnels are very small and well spaced. 



Alimentary canal : The plan of the alimentary canal is shown in 

 plate 31, figure 1. The middle portion (siphonal gut) is anchored 

 to the dorsal and dorsolateral regions of body wall, while the presi- 

 phonal gut (black) and hindgut (stippled) is fastened to the ventral 

 and ventrolateral walls. The presiphonal gut consists of a long loop, 

 the proximal half of which is anchored by very numerous frenula 

 close to right side of nerve cord. But the segment between + and + 

 is anchored by very numerous frenula to a cablelike muscle attached 

 forward (pi. 31, fig. 2). There is a conspicuous ciliated gi'oove ex- 

 tending the entire length of the presiphonal gut, the outer wall of 

 the proximal half of which is marked by transverse folds. The 

 siphon is well developed but is not indicated in figure. This siphonal 

 region of intestine (unshaded in figure) lies dorsally to the rest, while 

 the postsiphonal portion, characterized by ciliated groove, is mostly 

 on the left side. Its distal part is attached to the left of nerve cord. 

 The ciliated groove ends ventrally, in the usual place near end of 

 ventral blood vessel, but there is no coecum. The cloaca is relatively 

 small, and the outlet of each anal vesicle is close to anus. The con- 

 tents of intestine are not molded into pellets. 



The foregut has a constriction between the pharynx-esophagus and 

 the gizzard-stomach. The latter is marked by longitudinal and cir- 

 cular lines reflecting the grooves of the lining, but there is no sharp 



