436 H. Lyster Jameson 



the free ends of tlie papilhe to the body wall. This is evidenti}' 

 a speeies in which the hooks are poorly developed. 



Digestive System. The mouth is slit-like, situated in the centre 

 of the stump which remains where the proboscis is broken off. This 

 stump is well marked off from the body by a distinct groove, the 

 strongly developed papilla? of the body do not seem to extend on 

 to the proboscis. The mouth opens into a slig-htly dilated pharynx 

 (flg. 6 pli.)^ followed by an Oesophagus and a well marked crop [er.), 

 as in other Echiuroids; I cannot find a muscular gizzard, such as 

 I have described in Thalassema ncptimi (5). The crop is wider than 

 the adjacent parts, and sliows, notwithstanding the bad state of 

 preservation, traces of the longitudinal epithelial ridges that char- 

 acterize this division of the digestive canal. The vascular ring- 

 {v.r.) embraces the intestine about 7 mm behind the crop, it is 

 followed by a structure which seems to resemble the perivisceral 

 sinus described by Rietsch (8) in BonelUa. However, the defective 

 State of preservation prevented me from minutely investigating the 

 relations of this sinus. The intestine proper, i. e. the di vision 

 between the crop and the rectum, can be divided into three parts, 

 as in the Echiuroids gen erally; (1), an anterior part, provided with 

 a ciliated groove, but without a collateral intestine, about 100 mm 

 long; (2), the middle division, which has a collateral intestine, this 

 division measures about 130 mm; (3), a posterior division lacking- 

 the collateral intestine, but with a ciliated groove, measuring about 

 170 mm. The collateral intestine resembles macroscopically that of 

 T. neptuni, but appears to be somewhat wider, in proportion to the 

 intestine itself. I have not observed a ccecum on the beginning of 

 the rectum, such as occurs in Thalassema neptuni and other forms, 

 nor can I give any details as to the origin or end of the ciliated 

 groove, as the somewhat macerated condition of the internal organs 

 prohibited detailed microscopical study. 



A few ovoid sand balls were present in the posterior end of 

 the digestive canal. 



The intestine is, throughout its entire length, supported by 

 mesenteries, which are dorsal in position. 



The Anal vesicies are of the same type as in Tlialassema neptimi, 

 that is to say they are elongated, unbranched sacs, studded with 

 ciliated funnels; they are relatively shorter than in T. nept/mi, 

 measuring in the specimen I dissected only 12 — 15 mm in length. 



The Blood-vascular System (figs. 4 and 6). Owing to the absence 



