46 MR. E. J. MIERS ON CRUSTACEA FROM [Jan. 14, 



postero-lateral margin. Arms smooth ; wrist with a long spine on 

 its inner margin. The slender terminal joints of the legs are longer 

 than the preceding joints. Length of carapace and rostrum barely 

 3 lines. 



A single female example was collected at Matoya, at a depth o£ 

 6g fms. 



This specimen is of very small size ; but in the form of the fifth 

 ambulatory legs it appears to be generically distinct, both from Ho- 

 tnola and Tymolus, an allied genus from the Japanese seas, de- 

 scribed by Siimpson ; from the former genus it is further distinguished 

 by the form of the eyes, and from the latter by that of the front, 

 which is not quadridentate. 



Raninidea. 



Ranina serrata. 



Cancer raninus, Linn. Syst. Nat. (ed. xii.), p. 1039 (1766). 



Ranina serrata. Lam. Syst. An. sans Vert. p. 256 (1801); M.- 

 Edw. Crust, in Cuvier, Regne Animal (ed 3), Atlas, pi. xli ; Dana, 

 U.S. Expl. Exp. xiii. Crust, i. p. 404 (18.52). 



Ranina dentata, Latr. EucycL Meth. p. 268 (1825); M.-Edw. 

 Hist. Nat. Crust, ii. p. 194, pi. xxi. figs. 1-^4 (1837); De Haan, 

 Faun. Japon., Crust, p. 139, pi. xxxiv. S adult, pi. xxxv. fig. 1, $ 

 adult, figs. 2 & 3, front of 6, fig- 4, front of ? (1841). 



A single individual, a male, was collected in Olvasi, Nipon, of 

 moderate size, of this well-known species, which appears to be widely 

 distributed through the Indo-Pacific region. 



Lyreideus tridentatus ? 



Lyreideus tridentatus, De Haan, Faun. Japon., Crust, p. 140, pL 

 V. fig. 6 (1849). 



A single specimen in imperfect condition was collected in Kada 

 Bay, which I refer to De Haan's species with some doubt, as it 

 differs in several particulars from the figure in the ' Fauna Japonica,' 

 and the figures illustrating this work are, as a rule, most accurate. 

 The carapace in the specimen before me is proportionally narrower, 

 barely equalling in width half the total length. The greatest width 

 at the lateral spines is attained at a greater distance from 

 the front than in the specimen figured by De Haan ; the median 

 triangular lobe of the front is narrower ; and there are four spines 

 on the inferior margin of the hand. 



If the species should prove upon comparison to be distinct, it may 

 be designated L. elongatus. It in any case forms an interesting and 

 valuable addition to the national collection, in which the genus was 

 hitherto unrepresented ; nor does it appear that any specimens were 

 collected in the United States Expedition to the North Pacific, as 

 none are mentioned in Stimpson's Report. 



Porcellanidea. 



porcellana spinulifrons, sp. u. 



Two small specimens are in the collection, the exact locality 



