The Scottish Naturalist. 189 



antennal scale. Antmnal scale. — Ciliated on its inner margin 

 and at the apex, which has a small spine on the outer margin. 

 There is also a long sharp spine at the base of the scale. 

 Internal antenna. — Inserted within, and on the same line with, 

 the external antennae ; longer and much stronger than the 

 external ; movable portion ciliated on its inner margin, and 

 furnished with a tuft of cilia at the extremity, and another at its 

 base. External pedipalps. — Stout and pediform. Feet. — First 

 pair very long ; last segment armed with about twenty long 

 movable spines, arranged along each side and at the apex, 

 and two on wrist ; remaining pairs gradually becoming shorter 

 backwards. Abdomen. — Nearly cylindrical, narrowing rapidly 

 towards the tail. Tail. — Telson spear-shaped, with a mov- 

 able spine on each side, near the apex, and sometimes two 

 spines on its upper surface ; outer lateral, lamina broad, 

 truncate, ciliated on the inner margin; inner lateral lamina, 

 narrowing to an obtuse point, ciliated all round. 



Figure 9 (Plate V.) is the same as Figure 1, with this differ- 

 ence, that the last abdominal segment is furnished with a 

 strong, sharp, recurved spine above its junction with the tel- 

 son, which has always two spines on its median line, while 

 aberdonensis generally wants them. These differences I do not 

 think sufficient to warrant its being put down as a distinct 

 species. It may, however, be a sexual distinction; but this 

 has yet to be determined. 



This species (aberdonensis) is found in considerable abun- 

 dance on our sandy beach, in the months of March and April, 

 along with T borealis, a species named by the Rev. A. M. 

 Norman, for the identification of which I am obliged to that 

 gentleman. The principal difference between T. borealis and 

 T. aberdonensis is in the first pair of feet, which in T. borealis 

 are terminated with from eighteen to twenty long sharp spines, 

 all proceeding from the extremity of the limb : while in T. aber- 

 donensis eighteen spines are arranged along the sides of the last 

 segment of that member, and two more placed on the wrist. 

 The body and rostrum also differ in the two species. 



Lophogaster typhica Sars. — Occasionally cast on the beach. 

 In addition to the foregoing list I append the following 



