RATH BUN— MARINE BRACHYURA 



199 



Leucosiidae. 



18. Oreophorus reticulatus Adams and White (Plate 15, fig. 4). 

 Oreophorus reticulatus Alcock (2), p. 174. 



Cargados Carajos, 30 fms., Sta. B 17 ; 1 $ ovig. Amirante, 34 fms., Sta. E 9 ; 

 1 ? ovig. Saya de Malha, 55 fms., Sta. C 15 ; 1 ? ovig. Seychelles, 34 fms., Sta. F 8 ; 

 1 % ovig. 



Dimensions. — $, Amirante: C. 1. (entire) 11*4 mm., C. b. 15'6 mm. !j>, Saya de 

 Malha: C. 1. (entire) 12-3 mm., C. b. 17*1 mm. 



The first two specimens agree in most respects with Alcock's description. The 

 granules are flat-topped, in the intestinal-cardiac channel they are mostly stalked. The 

 edge of the front is truncate. The pterygostomian prominence is very protuberant, large 

 and blunt. The two lobes just above the posterior margin are well marked. The sternum 

 on either side of the penultimate segment of the abdomen is very prominent. The palms 

 are a little longer than wide (contrary to Alcock's description), and the fingers are not 

 twice as long as palm. The lower margin of the immovable finger and the upper margin 

 of the dactylus, have throughout their whole length a thin laminate margin with a 

 crenulated edge. 



The last two specimens are a little larger than the preceding and of so different an 

 aspect that one might easily consider them a distinct form. They are probably older, 

 better developed specimens of the same species, though all are ovigerous females. The 

 specimen from the Seychelles is coated everywhere except on the legs with a whitish 

 (in alcohol) nullipore, but so far as the characters are in evidence they agree with those 

 of the Saya de Malha specimen. In both, the granules are rounded off, confluent, and the 

 pitting and reticulation is more obscure. The median groove of the front is continued to 

 the edge, bilobing it. The pterygostomian prominence is small, tuberculiform. The two 

 lobes above the posterior margin are small and inconspicuous. The sternum is not pro- 

 tuberant above the abdomen. The palms are more swollen and a little wider than long, 

 the fingers about twice as long as palm ; the outer edges of the fingers are less thin. 



19. Heteronucia ingens, sp. nov. (Plate 17, fig. 2). 

 Amirante, 35 fms., Sta. E 14 ; 1 ? adult. 



Dimensions. — $, C. 1. to tip of frontal teeth, 10 mm., C. b. 10"8 mm. 



$. — Entire surface except of fingers and dactyli of legs covered with close-set 

 vesiculous granules, which are coarser on the abdomen and arms. On each lateral margin 

 are 7 tubercles or teeth ; 1 below the orbit, at angle of buccal cavity and projecting 

 forward beyond the front, 1 less advanced, on the pterygostomian region, 4 on the 

 branchial region, the second of which marks the widest point of the carapace, and 1 faintly 

 indicated at the extremity of the posterior margin. About 5 smaller lower tubercles 

 either side of the dorsal surface besides one on the hepatic region. Intestinal region a 

 little elevated above the surrounding area ; a shallow groove each side of nasogastric 

 region. Front broadly bidentate, neither the maxillipeds nor the margin of the buccal 

 SECOND SERIES— ZOOLOGY, VOL. XIV. 26 



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