390 CLARK! BOURGUETICRINIDAE 



Islands to between Sitka and the Columbia River; the cold deep water 

 between Norway and Iceland, and northward. 



Bathymetrical Range. — From 1337 to 4636 meters (743 to 2575 

 fathoms) . 



Thermal Range— From 30?9 Fahr. and -1?6C. to 36?6. Fahr. 



Included Species. — Ilycrinus australis (A. H. Clark), Ilycrinus car- 

 penterii Danielssen and Koren, and Ilycrinus complanatus (A. H. 

 Clark). 



Monachocrinus, gen. nov. 



Monachocrinus A. H. Clark, Eastman's translation of Zittel's Palaeon- 

 tology, 1913, p. 230. — A. H. Clark, Internationale Revue gesam- 

 ten Hydrobiologie und Hydrographie, 1914, p. 7. — A. H. Clark, 

 Die Crinoiden der Antarktis,- 1915, pp. 125, 152, 182. — A. H. Clark, 

 Amer. Journ. Sci. and Arts, 40, 1915, p. 61. A. H. Clark, Smiths. 

 Miscell. Coll., 65, 1915, No. 10, p. 11.— A. H. Clark, Amer. Nat- 

 uralist 49, 1915, pp. 525, 526, 527, 542. 



Diagnosis. — A genus of Bourgueticrinidae in which the arms divide 

 once, on the second post-radial ossicle (being ten or twelve in number) ; 

 all the post-radial ossicles are united in pairs by nonmuscular articu- 

 lation; and the basals are separate, or are fused into a solid ring which 

 is truncated conical, always longer than broad. 



Geographical Range. — -Caribbean Sea to the Azores and Morocco, and 

 northwestward to southwest of Iceland; the Bay of Bengal; the vicinity 

 of Banda and Celebes. 



Bathymetrical Range. — From 1236 to 4255 meters (687 to 2419 

 fathoms) . 



Thermal Range. — The only two records, both in the Atlantic, are 

 3?0C. and 40?0 Fahr. 



Included Species. — Monachocrinus caribbeus (A. H. Clark), Mona- 

 chocrinus minimus (Doderlein), Monachocrinus paradoxus (A. H. Clark), 

 Monachocrinus perrieri (Kcehler and Vaney), Monachocrinus pocidum 

 (Doderlein), Monachocrinus recuperatus (Perrier), and Monachocrinus 

 sexradiatus, sp. nov. 



Genotype. — Monachocrinus sexradiatus, sp. nov. 



Monachocrinus sexradiatus, sp. nov. 



Description. — The basals are anchylosed into a solid funnel-shaped 

 ring which is rather more than twice as long as broad basally. In lat- 

 eral view the sides of this funnel are almost parallel in the proximal 

 half, but in the distal half they gradually diverge so that their final 

 direction in relation to each other is the same as that of the two sides of 

 the radial circlet, with which they merge without any deflection. 



The radial funnel is composed of six similar radials of equal size, 

 and is about twice as high as broad at the base; in profile it is seen to 



