ORTHAGORISCICOLA MURICATA. 101 



1861. Lsemargus muricatus P. J. van Beneden. (15) p. 129. pi. xix, 

 figs. 1-4. 



1892. Lsemargus muricatus A. Scott. Trans. Xat. Hist. Soc. Glasgow, 

 vol. iii, pt. 3, p. 266. 



1900. L&margus muricatus T. Scott. (112) p. 158, pi. vi, figs. 39-42. 



1902. Orthagoriscicola muricata Poche. (97) p. 14. 



1907. Orthagoriscicola muricata C. B. Wilson. (148) p. 473, pis. xl & xli. 



1909. Orthagoriscicola muricata E. V. Elwes. (45) p. 20. 



1910. Orihagoriscicola muricata T. B. B. Stebbing. (125) p. 559. 



Female. Carapace trapezoidal in outline, much 

 wider behind than in front, postero-lateral corners 

 broadly rounded, lateral margins minutely serrated, 

 posterior margin slightly incurved, a number of 

 minute spines scattered over the dorsal surface of the 

 carapace, and the frontal plates apparently fused with 

 it. First and second thoracic segments short and about 

 half as wide as the carapace, attenuated at the sides 

 and without accessory dorsal plates. The next seg- 

 ment provided with a broad dorsal plate which overlaps 

 a considerable portion of the genital segment and is 

 divided by a median cleft into two broadly-rounded 

 lobes the margins of which are minutely serrated. The 

 genital segment furnished with t\vo large broadly- 

 expanded plates the inner margins of which somewhat 

 overlap each other ; the plates suborbicular in outline 

 and together fully one and a half times the width of 

 the carapace, also entirely concealing the abdomen and 

 caudal rami ; their posterior margins broadly rounded 

 and conspicuously serrated. 



Antennules of moderate length and composed of 

 three joints, the first as long as the other two com- 

 bined. Antennae short, armed with stout and strongly- 

 hooked terminal claws. Mandibles long, stylet-shaped, 

 and minutely serrate at the distal end. First maxilli- 

 peds small, provided with short but moderately broad 

 terminal claws serrated on the margins. Second 

 maxillipeds strong ; end joint with one or two marginal 

 processes on its inner aspect and provided with a 

 strong curved terminal claw considerably shorter than 

 the joint to which it is articulated. The thoracic 

 legs all biramose, the rami of the first and second pairs 



