470 Mr. E. J. Miers on Malaysian Crustacea. 



and C. collaris, in the classification recently proposed by 

 Schiodte and Meinert (Nat. Tidsskr. p. 287, 1879), on account 

 of the distinct but narrow linear interantennulary process 

 (lamina frontalis). The maxillipedes are slender, the basal 

 portion not exceeding the terminal palpus in width, and the 

 six anterior legs armed with a very small terminal claw. 



SlJCTORIA vel KHIZOCEPHALA. 

 Sacculina rotundata, sp. n. (PL XV. figs. 18, 19.) 



The animal in outline is transversely oval, somewhat com- 

 pressed, without any trace of the depression at the proximal 

 end of the sac which characterizes several of the oriental 

 species recently described by Kossmann (Arbeit, zool.- zootom. 

 Inst. Wiirzburg, i. pp. 121-136, 1872-74). 



The integument (unless microscopically examined) appears 

 smooth, but is transversely wrinkled, on account, perhaps, of 

 the long immersion of the specimen in spirits. On that surface 

 of the sac which is applied to the sternum of the crab on 

 which the Sacculina is parasitic are two wide and shallow 

 concavities, separated by an obtusely rounded longitudinal 

 median ridge which fits into the sternal suture (as in S. cor- 

 culum). The opposite face of the sac (i. e. that applied to the 

 abdomen of the crab) is regularly convex. The funnel- 

 shaped oral aperture is moderately produced, and very similar 

 to that of S. corculum as figured by Kossmann (t. c. pi. v. 

 fig. la) ; the distal aperture of the sac (Manteloffnung) is placed 

 on the sternal surface, and does not project at all from the 

 plane of the body. Length 5 lines, breadth 7 lines. 



A single specimen is in the collection, parasitic on a male 

 example of Erijjhia Iwvimana, without definite locality. 



I cannot identify it with any of the numerously described 

 species ; but as I have not had the opportunity of comparing 

 it with any of Kossm ami's types, it is with much hesitation 

 that 1 regard it as distinct. 



In most particulars this species is very nearly allied to S. 

 corculum, Kossmann (t. c. p. 122, pi. v. fig. 1), parasitic on 

 Atergatis jloridus from the Philippines. It differs chiefly in 

 the transverse oval, not cordiform shape of the sac. The 

 integument is armed with numerous minute spicules, which 

 are most abundant and conspicuous near the distal opening, 

 but quite imperceptible except under the microscope. They 

 seem to be rooted in the cellular tissue, beneath the outer 

 cuticle, and furthermore differ from the spinules of S. corculum, 

 and more nearly resemble the infracuticular spicules of S. 

 crucifera, Kossmann, in being very slender, not broader at 



