440 T. J. EVANS 



sacs of Lamiiiiiriii flexicaulis. Tlio cavities of these 

 sacs are rendered accessible to the smaller hsh by the boring 

 activities of various Prosobranchs, notably Helcion. The author 

 collected Calnia in August at Concarneau on Lepadogaster eggs 

 in Laminaria sacs, while Dr. Allen reports that at Plymouth 

 the animal is taken during the sunnner months on eggs of 

 Blennius ocellaris and Gobius minutus. 



External Appeakancb (hg. 1). 



When full grown C a 1 m a g 1 a u c o i d e s is about half an inch 

 in length, specimens obtained from Plymouth varying from 

 ()-'25 cm. to 1-8 cm. The body is depressed except when much 

 distended with food. The very broad foot (0-3 cm. in large 

 specimens) has a curved thick anterior rim, passing laterally 

 into processes capable of extension. The rhinophores (r/i.) and 

 cephalic tentacles (ct.) are smooth and of moderate length. 

 Linear cerata, sometimes thrown into a pyriform shape by the 

 contained food, are arranged in ten or eleven pairs of lateral 

 groups, varying in immber of cerata from four in front to two 

 or one behind. The members of a group are not arranged in 

 a row as in the Aeolididae, but irregularly, the smaller ones being 

 ventral. In even quite young individuals the pale yellowish 

 rosettes of the gonads ((/.) can be seen in the angles between the 

 bases of the groups of cerata, the grey centre of the rosette being 

 the large male acinus, round which the numerous female acini 

 are set. The pericardial hump (pc.) lies on the right opposite 

 the space between the second and third groups of cerata, and 

 with a strong lens the renal opening (r.o.) can be made out to 

 the right of it in front. This was mistaken by Trinchese for the 

 anal opening. With the exception of silvery white dots on the 

 tentacles and cerata, representing gland-cells, and the opaque 

 whiteness of the pedal glands w^hich are especially richly 

 distributed anteriorly, the integument is transparent, and the 

 colour of the animal varies with the condition of the stomach 

 contents and the gonads. In general, it is a dull greyish white 

 in wdiich the pigment of embryonic eyes may show as black 

 dots. Hecht (loc. cit.) makes much of the protective value 



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