574 ON iHE causTACEA or the'" skeat expebttion." [Dec. 3, 



II. I have since found that the name Actceopsis has ah*eady 

 been used to designate a fossil genus (Carter, Q. J. Greol. Soc. liv. 

 1898), and must therefore be dropped. Under these and the above 

 circumstances, I propose to rename the form Actites eryihrus^. 



Although, as Dr. de Man has kindly pointed out to me in cor- 

 respondence, this form is remarkably like the Carpilodes lophoinis 

 of Alcock (Journ, As, Soc. Bengal, 1898, p. 84, and Illustr. Zool. 

 'Investigator,' 1899, pi. xxxvi. fig. 2), I still feel that I was right 

 in separating it from the genus Carjniodcs. 



It most obviously resembles CarpUodes in the smooth and even 

 lobulation and grooving on the carapace ; but it also most obviously 

 differs from that genus in its prominent front, shape of lateral 

 mai'gins, and carinated legs. At the time I also saw what I 

 thought were palatal ridges, but, as Dr. de Man has since pointed 

 out to me, these are not true palatal ridges, but the " usual crests 

 situated at the antero-external angles of the endostome, as in 

 other species." Even so, however, the points I have enumerated 

 above would still prevent me from considering the species as a 

 Carpilodes, the prominence of the front and the shape of the 

 lateral margins contribute to a fades so remarkably unlike that 

 of a true Carpilodes. As to whether Major Alcock's species 

 should also be included in my genus, I am unwilling to express 

 a definite opinion, as I have not seen the type specimens; but, 

 judging from the description and figure given, it would seem to be 

 not unlikely. 



EXPLANATION OF THE PLATES. 

 Plate XXXIII. 



Fig. 1. Lamhrus Upj^iis (p. 536), dorsal view. 



2. Potamon ■mprovisiim (p. 546), dorsal view. 



2 a. Young from beneath abdomen. 



3. Pimwiheres socius (p. 561), 3rd maxillipede. 



4. Palamon paucidens (p. 568), from left side. 



4 a, ib, 4 c. Different types of rostrum. 



Plate XXXIV. 



Fig. 1. Caridina gracUUma (p. 560), from right side. 



2. CalUanassa secura (p. f 55), from right side. 



2 a. Front of carapace. 



3. Automate doUchognatha (p. 564), larger cbelipede. 



3 a. Smaller chelipede. 



4. PalcBmon equidens (p. 565), abnormal chelipede. 



5. Pencsus canaMcidatiis yiLr.? (]) 571). Thelycum. 



6. Penceus inutatns{Y>. b72). Petasma, anterior and posterior views. 



6rt. Tlielycmn. 



6 b. Anterior, Q c. Posterior -views of petasma. 



7. Penaus sp. (p. 571). Petasma, anterior and posterior views. 



7 a. Anterior, 7 b. Posterior views of petasma. 



^ Actites, = " a, dweller bj the shore," will also, I hope, indicate the close 

 position of this genus to the Actajids. 



