HOLOTHURIOIDEA 649 



H. floridana* Pourtales {H. mexicana Ludwig). Body elongated, 

 cylindrical, 20 to 40 cm. long; color brown or yellowish, often reddish 

 below; ambulacral appendages with suckers on the under surface and 

 with or without them on the upper: Florida and West Indies. 



Family 2. CUCUMERIIDAE. 



Holothurians with 10 to 20 branched oral tentacles; ambulacral 

 feet and respiratory tree present; genital pore often inside the ring 

 of tentacles: 12 genera and over 200 species. 



Key to the genera of Cucumeriidae here described: 



Oi Lower surface of body not flattened, the distribution of its ambulacral 

 appendages not different from that of the upper surface. 



6i Feet in rows and mostly confined to the radii 1. Cucumaria 



62 Feet scattered thickly over the entire surface 2. Thyone 



Oa Lower surface flattened to form a distinct creeping sole ; 10 tentacles ; 



no feet on the upper surface 3. PsoLUS 



1. Ctjctjmaria Blainville. Body usually thick, with 10 tentacles 

 and with feet in rows in the radii, a few feet often being also scattered 

 over the interradii, at least dorsally: 73 species. 



Fig. 992 Fig. 993 



Fig. 992 — Cucumaria frondosa (Clark). Fig. 993 — Thyone hriareus (Clark), 



C. frondosa (Gunnerus) (Fig. 992). Length 20 to 30 cm.; thick- 

 ness 10 cm.; color reddish or brown, much darker above than below; a 

 few ambulacral appendages on the interradii: Nantucket and north- 

 wards from low-water mark to 200 fathoms; abundant on the Maine 

 coast; Europe. 



C. pulcherrima (Ayers). Length 5 cm.; thickness 2 cm.; body 

 ovate; color whitish; no feet on the interradii: Vineyard Sound to 

 South Carolina, in shallow water. 



2. Thyone Oken. Body ovate or elongate, with 10 tentacles and 

 with feet scattered thickly over the entire surface: 39 species. 



T. rubra Clark. Red above, whitish below; 20 mm. long; viviparous: 

 California. 



T. briareus (Lesueur) (Fig. 993). Length 12 cm.; thickness 3 cm.; 

 color dull brown, or black: Vineyard Sound and southwards, in mud 

 in shallow water; locally coniinon. 



• See "The Development of Holothuria floridana," b.y C, L. Edwards, Jour. 

 Morph., Vol. 20, p. 211, 1909. 



