62 CHAS. L. WALTON AND OLWEN M. KEES. 



agrees so well with the description and beautiful figures of E. claparedi 

 (Panceri) given by Professor Andres (Le Attinie, p. 90, pi. xi.) that we 

 may with justice, for the present, allocate it to that species." 



After examination and comparison of both external and anatomical 

 characters, we are able to identify as E. claparedi two specimens from 

 Plymouth ; and the species can thus be ajdded to the British Fauna 

 with certainty. 



Of the two specimens just mentioned, one (a) was kept alive for a 

 considerable time at Plymouth, was safely sent to us at Aberystwyth^ 

 and remained in a healthy condition, living buried in sand in a shallow 

 dish. When first received it was very timid and remained buried for 

 twenty-four hours, expanding at first only by night, and closing rapidly 

 at the least vibration. Later it would remain expanded during dayhght 

 and for much longer periods, and it also became much less sensitive ta 

 movements in its vicinity. Both specimens were obtained from Jenny- 

 cliff Bay, Plymouth Sound. 



Size. — It was impossible to obtain complete measurements of (a) 

 during life, as it remained buried, and if uncovered retracted and at 

 once commenced to bury itself by the use of the physa. When partially 

 anaesthetized the total length was 50 mm. ; greatest diameter of scapus 

 7-5 mm. ; of capitulum 4 mm. ; the physa was 4 to 5 mm. in length and 

 breadth ; and the expanse of the tentacular crown 12 to 13 mm. The 

 physa was rounded, delicate in texture, and almost transparent. Scapus 

 cylindrical, fairly stout, tapering downwards to just above the physa, 

 ringed and folded during partial retraction ; grooved by the insertion of 

 the mesenteries, with the intervening ridges warted. Scapus covered 

 by a thin cuticle which is thickest on the ridges and about the warts ; 

 these latter occur in a linear row on each ridge and are seldom contiguous ; 

 the upper third of the scapus is bare of cuticle and the warts are fewer 

 and finally disappear. The capitulum and upper portion of the scapus 

 can be retracted within the remainder of the scapus, and this movement 

 can be very rapidly effected. The tentacles are sixteen in number, slender, 

 tapering, about twice as long as the diameter of the disk ; held in a most 

 irregular manner as a rule, some extended, others flexed, others bent in 

 a contorted manner across the disk ; occasionally all are regularly 

 extended, the tips bent inward (as shown in Fig. 1). 



Colour.- — ^Physa almost transparent. Cuticle rust-red, but darker 

 where thickest (as around the warts). On the summit of the warts the 

 cuticle is frequently missing and they then appear as pale spots. Capitu- 

 lum dull opaque flesh colour, near the summit is an indistinct white 



