■ >2 AMPniPODA NORMALIA. 



wliich terminate in shai^p spines. First pair of gnathopoda small, 

 luiAnng the propodos not broader than the carpus, but twice as 

 long as broad ; palm obU(]ue and minutely ciliated ; a slight pro- 

 jection or small tooth antagonizes against the apex of the dac- 

 t5'los ; the carpus is slightly produced inferiorly. Second pair of 

 gnathopoda somewhat larger than the preceding and like them 

 in form. Coxae of the four anterior paii's of legs nearly as deep 

 as the respective segments of the body of the animal. Coxae of 

 the third pair of pereiopoda only half as long as the preceding. 

 Pereiopoda short, robust, and terminating in a shai-j), curved, 

 powerful dactylos, which antagonizes, in closing upon the propodos, 

 against two short strong hairs curved at the apex and fiuTiishcd 

 down one side with a series of flat sharp teeth. Last three pairs 

 of pleopoda veiy short and stout, their terminal rami being 

 shorter than their respective bases. Telson small, and cleft from 

 the apex to the base. 

 Length ^ths of an inch. 



All the segments of the animal are very similar in length — a cii'- 

 cumstance that enables it to roll itself into a more circular form than 

 the generality of Amphipods. This affords a diagnosis by Avhich the 

 animal may be readily detected. It is generally free from haii's ; a 

 few short ones, however, exist, of a somewhat pyriform shape, with 

 the apex di\dded into two equal parts. The integument, under the 

 microscope, shows the presence of the ~]~-mark, somewhat modified 

 from Talitrus, &c. The whole structui'e is also granulated all over, 

 and interspersed with short hairs. 



Ilah. Falmouth (Mr. W. Webster ) ; Penzance (Mr. Hams and 

 Mr. G. Barlee) ; Northumberland (Mr. J. Alder). 



I have named this species after Mr. John Lubbock, whose name is 

 so intimately associated with the study of the Crustacea. 



2. Nicea Lucasii. (Plate I. a. fig. 7.) 

 Nicea Lucasii, Nicolet, Gay's Chili, vol. iii. p. 237. 



I have seen no specimen of this species. It appears to differ from 

 the British form, so far as I can judge from the figure and descrip- 

 tion in Gay's work, in the shortness of the propodos in both pairs of 

 gnathopoda, and in the singularly tubercidated appearance of the 

 maxillipeds. 



Dana is inclined to think it synonymous with his genus Allor- 

 chesfes ; but its general form is so similar to the preceding species, 

 that I have no doubt they belong to the same. 



Length ^ths of an inch. 



Hab. Coast of ChiU {Gmj). 



