402 P:CHIN0DERMS of the BRITISH ISLES 



In British seas this species appears to be common on the 

 south coast of En inland (Plymouth), and on the west coast of 

 Ireland, occurring from the shore down to ca. 45 m. Elsewhere 

 known from the Atlantic coasts of France and from the Azores, 

 down to a depth of 130 m. 



5. Cucumaria Normani Pace. (Fig. 241, 2.) 



(Syn. Cucumaria Montagui Flem., partim ; C. Lefevrei 

 Barrois ; Semperia Lefebvrei Herouard.) 



Body almost cylindrical, skin tough, leathery, surface 

 wrinkled. Tube-feet in distinct double rows ; there may also 

 be some in the interradii ; those of the dorsal side not trans- 

 formed into papillae. Gonadial tubes very numerous, ca. 500 or 

 more, small, cylindrical. Deposits (Fig. 241, 2) with 4 holes 

 and on the upper side ca. 12 very prominent nodules. Surface 

 spicules cup-shaped, forming a continuous layer. Spicules of 

 tube -feet with 2 or more parallel rows of holes, or larger, 

 irregular plates. Colour dirty brownish-white, becoming black 

 when exposed to light. Grows to a length of ca. 15 cm. 



Mainly a littoral form, like the preceding species. Spawning 

 period about March. 



In British seas this species is known from the south coast 

 (Plymouth) and the west coast of Ireland ; it appears to be 

 less common than the preceding species. Known elsewhere only 

 from the Atlantic coasts of France. It is not known from more 

 than 20 m. depth. ^ 



6. Cucumaria lactea (Forbes). (Figs. 237, 1 ; 241, 3.) 



(Syn. Ocnus lacteus Forbes ; 0. hrunneus Forbes ^ ; 

 Cue. master ensis Grieg.) 



Body cylindrical. Skin very thick, leathery, smooth. Tube- 

 feet scarce, in zig-zag rows ; they are not quite retractile. The 



1 A variety corogna Herouard (from the harbour of Coruna) differs 

 from the type in its colour, greyish, with the tube-feet yellowish-red. The 

 deposits are slightly smaller than in the type. As the single specimen known 

 was covered with Nematods, boring into the base of the tube -feet, it seems 

 very doubtful whether the characters presented by this specimen are any- 

 thing but pathological, and the value of this variety is very problematic. 



2 The species described in Koehler's JEchinodermes, Faune de France, 

 p. 164, under the name of Cucumaria brunnea (Forbes), is evidently not 

 identical with 0. lactea, but apparently represents a separate species. 

 Koehler records it as occurring both in the Mediterranean and on the Channel 



