LEPAS ANATIFERA. 75 



other at less than a right angle ; their sharpness and precise 

 form variable j rim between them reflexed (figs. 1 a and b), 

 making a slight notch behind. Peduncle smooth, wrinkled, 

 length in proportion to that of the capitulum varying, from 

 barely equalling it, to six or seven times as long. I have 

 noticed a specimen including mature ova, with a capitulum 

 under half an inch long. 



Filamentary Appendages ; — never more than two on 

 each side, with sometimes only one developed ; of variable 

 length ; one seated on the flank of the prosoma, under 

 the first cirrus ; the second close under the basal articula- 

 tion of this cirrus, on the posterior face of a slight swelling : 

 these appendages- correspond with g and h in Fig. 4, 

 PL IX. 



Mouth. — Mandibles (PL IX, fig. 5), with, as usual, five 

 teeth, all pointing downwards. Maxillae (PL IX, fig. 9), 

 with the lower step of variable width compared to the two 

 upper steps. Cirri; posterior cirri with segments (fig. 26) 

 bearing six pair of spines ; intermediate fine spines rather 

 long ; first cirrus, anterior ramus longer by only about 

 two segments than the posterior ramus ; second cirrus 

 with anterior ramus, with very broad transverse rows 

 of bristles; spine-bearing surfaces considerably protu- 

 berant ; caudal prominences smooth, rounded. 



Si%e. — The largest specimen which I have seen had a 

 capitulum two inches in length ; the longest, including 

 the peduncle, was sixteen inches. 



Colours. — Calcareous valves already described. Edges 

 of the orifice bright scarlet orange ; basal edges of the 

 scuta, and sometimes of all the valves, with a torn border 

 of orange membrane. Interspaces between the valves dull 

 orange-brown. Peduncle darkish purplish-brown, with 

 the lower part sometimes pale ; chitine membrane itself 

 tinted orange ; in young specimens, peduncle pale, the 

 colour first appearing in the uppermost part, close under 

 the capitulum ; this upper part is often darker than the 

 other parts, and never orange-coloured, as in L. Hillii 

 and L. anserifera. Sack internally dark purplish lead- 



