MONOGRAPH OF THE LEUCOSIAD^E. 297 



These characters, taken in both cases from males, are constant, as far as we can judge 

 from the examination of several specimens in the British Museum. 

 Length of carapace 1*3 in. 



Myra carinata, mihi (Tab. XXXII. fig. 3). Testa ovata, minute granulata, carinata; 



spina postica media, lateralibus ter quaterve longiore, lateralibus conicis, acutis. 

 ?? Cancer punctatus, Herbst. 

 ?? Ilia punctata, Edw. Hist. Nat. Crust, ii. p. 125. 

 Hab. ad insulas Philippinas. Muss. Brit., Bell. 



Carapace ovate, minutely granulated, particularly at the posterior part, distinctly but 

 slightly carinated along the centre ; the hepatic ridge and lateral margin granulated, the 

 former having a small tubercle ; the pterygostomian tooth broadly triangular ; the cen- 

 tral spine on the intestinal region at least three times as long as the lateral ones, which 

 are conical and acute. The anterior pair of legs in the female twice the length of the 

 carapace, exclusive of the spine ; the arm covered with tubercles ; the hand slightly tumid 

 near the base, but less so than in M. fugax, narrowed forwards ; fingers closed through- 

 out their length, finely toothed. Abdomen in the female with the fourth, fifth and sixth 

 segments united, as in M. fugax. 



Length of carapace 1 in. 



The most obvious distinction between the present species and the one previously known, 

 consists in the carinated form of the carapace, which, although not very strongly marked, 

 is quite distinct, and differs obviously from the rounded surface of M. fugax. Another 

 important distinction is in the comparative length of the three spines on the hinder part 

 of the carapace, the central one being in the present species so much longer in proportion 

 to the lateral ones than it is in the former. Whether this is the species figured by Herbst 

 as Cancer punctatus I am not sure, but it resembles very closely his figures assigned to 

 that species. As Professor Milne-Edwards refers to that authority for his Ilia punctata, 

 and as those figures certainly do not represent an Ilia at all, I am inclined to doubt the 

 existence of such a species of that genus, and to refer it to Myra. 



Myra elegans, mihi (Tab. XXXII. fig. 4). Testa bis longiore quam latiore (spina 



postica non inclusa), margine anteriore setoso. 

 Hab. in mari orientali. Mus. Brit. 



Carapace oval, twice as long as broad, the central posterior spine nearly half the length 

 of the carapace, the lateral ones extremely small ; a slight longitudinal carina, which is 

 granulated, and there are patches of granules on the branchial and cardiac regions ; front 

 produced, slightly emarginate. Prom the front to the hepatic region the margin has a 

 line of stiff curved setae. External pedipalps quite plain ; the outer margin of the palp 

 less dilated than in other species. The legs very slender; the arm granulated. The 

 fingers longer than the hand ; the four posterior pairs of feet, particularly the fifth pair, 

 with the last two joints strongly ciliated. Abdomen of imperfect female oval, with the 

 third to the fifth segments united. 



Length of carapace, without the spine, 0-4 in. ; of the spine, 0-2 in. 



Of this small and gracile species, one specimen, an imperfect female, exists in the 



