P. P. C. HOEK. 



[REP OF THE "MICHAEL SARS" NORTH 



a yellowish ball as described by Darwin, associated with 

 a colony of L. pectinata. 



Stat. 92. July 23, 1910. Lat. 48° 29' N., Long. 

 13° 55' W. Surface. Large fine specimens attached to 

 yellowish ball, associated with very small specimens of 

 L. pectinata. 



Observations. This species has been observed 

 in nearly all the temperate and tropical seas of the world. 



6. Poecilasma carinatum Hoek. 



Stat. 53. June 8—9, 1910. Lat. 34° 59' N., Long. 

 33° l'W, Depth 2615—2865 m. Bottom: Globigerina ooze. 



Three specimens attached to a thick bundle of the 

 long spicules of a siliceous sponge protruding from a soft 

 brownish mass, representing, perhaps, the sponge itself. 



Observations. This deep-sea species is now 

 known from different places in the Atlantic, in depths 

 varying from 600 to 2865 metres. Pilsbry transferred this 

 species, to the genus Megalasma, founded by me in 1883, 

 but I cannot recognize the advantage of so doing. 



7. Conchoderma virgatum Spengler. 

 var. chelonophila Leach. 



Stat. 56. June 11, 1910. Lat. 36° 53' N, Long. 

 29° 47' W. Surface. A group of middle-sized and small 

 specimens was found attached to a turtle, associated with 

 a group of specimens of L. HUH. 



Observations. The species C. virgatum is found 

 in all the seas of the world. The variety chelonophila 

 occurs in the Atlantic only, so far as I know. 



time, Gruvel preferred the name S. velutinum. This 

 example was followed by Pilsbry and I think it better, 

 therefore, to do so also. 



A very small specimen of a Scalpellum, the capitulum 

 of which measures 2-7 mm in length, was taken at Stat. 

 24, and my be considered as also belonging to this species. 

 It much resembles the figure given by Gruvel of a young- 

 specimen of this species. 



This species seems to occur throughout the Atlantic. 

 Pilsbry says it has a wide range on both sides of this 

 ocean, but it seems to reach farther north on the American 

 than on the European side. Annandale mentions it as 

 occurring in the Irish Seas: Lat. 51° 22' N., Long. 12° 0' 

 W., 695 — 720 fathoms. According to the same author it 

 is also found in the Gulf of Oman (entrance to the Per- 

 sian Gulf) and in the Indian Ocean. 



9. Scalpellum dicheloplax Pilsbry. 



Stat. 10. April 19-21, 1910. Lat. 45° 26' N., Long. 

 9° 20' W. Depth 4700 m. Bottom: Globigerina ooze. 

 Two specimens attached to stones. 



Observations. Pilsbry gives three different figures 

 of this species, but the two "Michael Sars" specimens do 

 not exactly resemble any of these figures, yet there 

 can be no doubt they belong to the same species, being 

 intermediate in every detail in which they do not quite 

 agree between the forms figured by Pilsbry. It is one of 

 the larger species of the genus: the length of the capitulum 

 in one specimen is 32 mm in the other 38 mm. 



This species seems to occur at different places in 

 the Atlantic, in depths varying from 2750 to 4700 m. 



8. Scalpellum velutinum Hoek. 



Stat. 24. May 6-7, 1910. Lat. 35° 34' N., Long. 

 7° 35' W. Depth 1615 m. Bottom: Globigerina ooze, 

 a very small specimen and a larger. 



Stat. 53. June 8—9, 1910. Lat. 34° 59' N, Long. 

 33° 1' W. Depth 2615—2865 m. Bottom: Globigerina 

 ooze. One specimen. 



Both ot the larger specimens are attached to stones, 

 while the small one is free. 



Observations. In the specimen from Station 24 

 the capitulum has a length of 29 mm, and represents 

 my S. velutinum; that from Stat. 53 is larger (length 

 of the capitulum 44 mm), and looks much like my 5. 

 eximium. Gruvel had an opportunity of comparing 

 numerous specimens of both forms and came to the 

 conclusion that they belong to the same species. Though 

 my S. eximium represents the full-grown stage, and the 

 descriptions of both species were published at the same 



10. Scalpellum atlanticum Gruvel. 



Stat. 23. May 5—6, 1910. Lat. 35° 32' N, Long. 

 7° 7' W. Depth 1215 m. Bottom: Globigerina ooze. 

 Three specimens, two of which are attached to a spicule 

 of a siliceous sponge. 



Observations. The specimens correspond fairly 

 well, but not absolutely, with the description of Gruvel. 

 The capitulum is covered by a delicate chitinous skin, 

 but the numerous short hairs observed by Gruvel are 

 wanting. The occludent margin of the tergum and scutum 

 is not so»strongly arched as in Gruvel's figure. In his 

 specimen the apex of the tergum was recurved, but it is 

 rather straight in these specimens. Gruvel says there is 

 a slight exavation in the lateral margin of the scutum 

 for the reception of the apex of the upper latus, but there 

 is hardly a trace of such an excavation in the "Michael 

 Sars" specimens. According to Gruvel, the scales of 

 the peduncle are placed in 8 rows, in the specimens I 



