of Ticcent Species 0/ Li mill m. 265 



a'. Distal seLMiKMits of inner branches of genital 

 o|)erciiluiu disunited and overlapping in S 

 and $ Hoeveni, sp. n. 



i'. Distal .segments of inner branches of genital 



operculum united in S »n<i $ ff'ff^^'^t Miiller. 



Genus Cakcin'OSCOKpius, nov. 

 (PI. V. Hg. B and PI. VI. Hgs. 3, 5.) 



No spur on apex of fourth segment of last appendage of 

 prosoma. Inner branches of genital operculum extending 

 distally as far as the tips of the outer branches. Postanal 

 spine cylindrical, neither crested above nor grooved below. 

 Clasj)ers of male completely chelate, the fingers long, slender, 

 and similar in form. J\Iovable spines bordering the opi.-4tho- 

 soma short in the two sexes, the second and third the longest, 

 the rest either progressively decreasing in length from before 

 backwards in the male, or becoming abruptly shorter in the 

 female. 



Ti/pe. Species represented by specimens in British ^luseum 

 identified as L. rutundicaudcij Latreille^ from the Gulf of 

 Slam (6'. S. Flower, 99. 9. 7. 66). 



Garcinoscorpiua rotundicauda (Litr.). 



Liinulus rotwidieauda, Latr. iu Hist. Xat. Crust, et Ins. iv. p. 98 

 (laO:^); id. Sonniui's BufEon, Ins. iv. p. 89 (1802) ; aud of all subse- 

 quent authors. 



Distribution. This species apparently extends further to the 

 west than Tachypleus gigas ox T. tridoifatus. In the British 

 Museum there are examples ticketed " India and Bengal," 

 also others from Malaysia, Pinang, and tiie Gulf of iSiam 

 (aS'. S. Ftoictr) ; Van der lloeven's specimens came from the 

 Moluccas, and Mosoley has recorded it from Zambounga in 

 the Philippines. 



EXPLANATION OF TIIE PLATES. 

 Pl.\te V. 



Fiy. A.. G e. Atdl OY>GYCu.\\xm o{ Xi/Jiusura poli/p/ienitis, c?. 



yiy. 15. (jenital opeiculum of Carciivoscorpius rotundicauda, J. 



Fiy. C. Ditto of I'achypleus yiyiis, $ . 



Fiy. D. Ditto of Tachyjjltus lloeceni, sp. u., showing the overlap of the 

 distal segments of the inner branch (alter Van der Iloeven). 



Fiy. E. Second appendage of opisthosoma of T. tridentatus, J , to illus- 

 trate the derivation of the ctructure of the geniUil operculum, 



Letteriny: — I, II, III, segments of the exopodite : 1, 2 ; 1, 2, 3 ; aud 

 1, 2, 3, 4, segments of endopodite. The segment numbered 1 lieie 

 a.<«signed to the endopodite may be part of tue .second segment of the exo- 

 podite separated from it by a s -condarily acquired sutuie. 



