REPORT ON THE GEPHYREA. 13 



On anatomical examination the minute specimen (13 mm.) of tli(! Challenger Expedi- 

 tion was, seen to be identical with the Phascolosoma priohi of Sluiter. 



Habitat.— ^taimu 214, on February 10, 1875; lat. 4° 33' K, long. 127° 6' E.; depth, 

 500 fathoms; bottom temperature, 41°'8 ; blue mud; dredged. 



Sluiter obtained his specimens from Dentalium shells at Tandjong Priok, Batavia. In 

 regard to the specimen above referred to, there is no note as to whether it also was 

 obtained from a Mollusc shell. 



11. Phascolosoma catharinw, Fritz Miiller. 



Phascolosoma catharinie, Fritz Miiller ; Grube, Notiz iiber Loxosiphon, Oloeosiphon und einige 



Phascolosomen, Jahresbericht der Scliles. Gesellsch. fiir vaterl. Ciiltiir, Jahr 1867, p. 48, 

 Breslau, 1808. 



Phascolosoma catharinm, Selenka and de Man, Die Sipuncididen, &c. (loc. cit.), pp. I.t, 16, 



Taf. ii. fig. 16, Taf. v. figs. 60-63, 1883. 



The body is long and narrow, with a slender proboscis four times as long as the body. 

 The skin is thin and iridescent. Only with the aid of a lens can one recognise the 

 minute papillte which cover the whole body. These papillae are thinly scattered and 

 have a conical form. At the posterior end of the body they measure 0"066 mm. in height 

 and half as much in breadth, at the middle of the body they are somewhat smaller, and at 

 the base of the proboscis somewhat larger again {up to 0"09 mm. in height). There are two 

 slender ventral retractors, which originate in the posterior fourth part of the body, and 

 which do not unite till far forward in the proboscis. The contractile tube is studded with 

 short villi. The coils of the intestine are not numerous. There are two fixing muscles on 

 the anterior coils. The two free segmental organs open a short distance in front of the anus. 



Hahitat.— Station 323, February 28, 1876; lat. 35° 39' S., long. 50° 47' W.; depth, 

 1900 fathoms ; bottom temperature, 33°-l ; blue mud ; trawled. Of this there is only a 

 single specimen. 



Since Fritz Miiller's specimen was labelled "Desterro," one may infer that it was not 

 obtained in trawling, but was found on the shore during ebb tide. The specimen of the 

 Challenger Expedition, on the other hand, was obtained from a very considerable depth. 

 This difference of distribution is not, however, by any means unicjue, for other true 

 Sipunculids exhibit a similar occurrence on the shore and at considerable depths. 



12. Phascolosoma flagrifeyum, n. sp. (PI. III. fig. 17). 



Body and proboscis studded with very small papilla?, hardly visible witli a lens. The 

 •posterior end of the body is furnished with wart-like papilku measuring half a millimetre, 

 and with a whip-like appendage. The coils of the intestine are veiy numerous. 



The largest of the three specimens of this form measured with outstretched proboscis 

 was 130 mm. in length, and had a breadth of about 13 mm. 



