CETTSTACEA. 559 



fingers are acute, slightly incurved at the tips, and have their inner 

 margins thin-edged and entire; the three following pairs of legs 

 have the joints smooth, naked, and rounded ; the merus-joints hut 

 little thickened and without spinules ; the penultimate joints have 

 a small mobile spinule at the distal end of their posterior margin ; 

 daotylus with a single small accessory spinule. The whole of the 

 upper and lateral surface of the carapace and the legs are closely 

 punctulated with small circular red spots j the ground-colour is 

 yellowish. Length of carapace nearly 6 lines (12 millim.). 



A single male was obtained on the beach at Mozambique, between 

 tide-marks (No. 224). 



There is scarcely any character mentioned in M. Milne-Edwards's 

 very short description, based on a specimen from Few Ireland, 

 that will not apply to the specimen from Mozambique, unless it be 

 what relates to the spines of the wrist. 



13. Petrolisthes villosus ? 



? Porcellana villosa, Michters, Decapoda, in Mobius's Beitrage zur 

 Meeresfavna der Insel Mauritius und der Seychellen, p. 160, 

 pi. xvii. figs. 11, 12 (1880). 



A small male collected at Darros Island (No. 200) with P. la- 

 marckii is referred here. To Dr. Eichters's short description I may 

 add the following :^ — The median frontal lobe is prominent and 

 rounded, and more distinctly defined than in P. lamarcMi, var. 

 asiatica. There is apparently no spinule on the lateral margin of 

 the carapace. There is a strong lobe or tooth at the distal end of 

 the merus-joint of the chelipedes ; between the three prominent 

 lobes or teeth of the anterior margin of the ■^rist are one or two 

 smaller teeth; the posterior margin of the wrist is entire. The 

 dactyli of the first to third ambulatory legs have three small acces- 

 sory spinules. This species has been hitherto a desideratum to the 

 Museum collection. 



14. Polyonyx biungiiiculatus (Dana). 



Several specimens from the Seychelles, 4-12 fms. (No. 194), and 

 Etoile Island, 13 fms. (No. 191), are referred to this species, which, 

 as I have stated in the preceding part of this Eeport (p. 271), is dis- 

 tinguished from P. ohesulus by the much more prominent and acute 

 median lobe of the front. I may add that the specimens I have 

 examined, both from the ' Alert ' collection and from the Gulf of 

 Suez (B. MacAndrew), have a prominent lobe at theinner and distal 

 angle of the merus-joint of the chelipedes, which is not represented 

 in Dana's figure of this species, and which is scarcely or not at all 

 developed in P. ohesulus. This character wiU perhaps be found 

 sufficient to distinguish these specimens from P. hiunguiculatus, 

 Dana, at least as a marked variety. 



