TO IXDrAX CAECIXOLOGT. 349 



each lobe is a short curved spine dii'ectccl forwards (an imaginary line joining these two 

 spines marks the junction of the vertical rostrum with the horizontal apex). The anterior 

 orbital fissure is linear and twice as deep as the wider posterior fissure. On the posterior 

 margin of the carapace are three perfectly hemispherical smooth tubercles exactly 

 resembling pearls set in the margin, and slightly smaller than the ocular corne:c ; a 

 finely crenulated line separates the median from the lateral pearl on each side. The 

 basal antennal joint has two or three short spines in front of the orbit, and the second 

 peduncular joint is not specially dilated ; the flagellum carries a few short hairs. 



The chclipedes in the male are finely granulated on the upper and lower surfaces of 

 the merus, the whole of the carpus, and the inner surface of the hand and fingers ; on the 

 inner surface of the hand the granules become subspinulose, while the outer surface of 

 the hand and fingers is smooth. The ojiposiug edges of the fingers arc finely crenulated, 

 and there is a slight basal hiatus between them; the finger-tips are dark in colom*. 

 The ambulatory legs are very hairy, with the meral joints enlarged and flattened distally, 

 and a slight lobe occurs on the posterior distal margin of these joints. 



The male carapace is 15 mm. long and 12 mm. broad, the chelipcdes 20 mm. long, and 

 the second ambulatory leg 17 mm. long ; the carapace of the larger female is ouly 9 mm. 

 long. 



This small species is distinguished l)y its three pearl-like tubercles, the form of the 

 front and of the ambulatory legs, &c. M. cnrtispina, Haswell, has a similarly deflexed 

 rostrum, but it terminates in four rounded lobes, and there are other points of dilference. 



Genus Tylocarcinus, Miers. 



25. Tylocarcinus Styx (Herbst). 



Miciop/injs Styx (Herbst), A. ^riliic-Echvards, Noiiv. Arch. Mus. Ilist. Nat. t. viii. p. 24", pi. xi 

 fig. -1 (187.2), ubi synun. 



Eameswaram, Tuticorin, and ^luttuwartu Par [Thurston). Common on the reef at 

 E-amcswaram (/. B. H.). 



The general colour of this species is yellowish, with red mottlings on the gastric and 

 branchial regions of the carapace, and along the upper surface of the legs ; smaller red 

 spots and lines are foimd on the cheli})cdcs. 



BislribiUion. From tlic Red Sea to flic Pacific. 



Genus Lambkus, Leach. 



26. Lambrus loxgimani s (Linn.). 



L. lom/imanns (limn.) , Milne-Edwards, Hist. \at. Crust, t. i. p. .3') I- (1834); Miers, Ami. Mag. Nat. 

 Hist. ser. 5, vol. iv. p. 20 (1879). 



Ceylon (Haly) ; Gulf of Martaban {0(f(i'.s) ■ Madras (./. h\ H.). 



A male from Madras has the carapace 25-5 mm. long and 27"5 mm. broad, tlie right 

 chelipcde 102 mm. long. 



Dintrihnlion. Mauritius, Mergui, Malay Archipelago, N. and N.K. Australia. 



SECOND SERIES. — ZOOLOGY, VOL. V. .",1 



