360 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



Micippa ovata, var. laevis Lockington, Proc. California Acad. Sci., vol. 7^ 



1876 (1877), p. 69 [7] (type-locality, Gulf of California; type not extant). 

 Othonia nicholsi Rathbun, Proc. U. S. Nat. Mus., vol. 15, 1892, p. 257, pL 



35, fig. 3 (type-locality, Gulf of California, 45 fathoms; holotype. Cat. 



No. 15822, U.S.N.M.). 

 Pitho quinquedentata Rathbun (not Bell), Proc. U. S. Nat. Mus., vol. 21, 



1898, p. 578; vol. 38, 1910, p. 573 (part). 



Diagnosis. — Lateral teeth of carapace five, acute, the second and 

 third united at base. Male appendages distally lyre-shaped. Outer 

 margins of outer orbital teeth anteriorly convergent. 



Description. — Carapace pubescent, tubercles furnished with long 

 hairs. Legs long-hairy. Carapace shaped rnuch as in P. aculeata, 

 but fronto-orbital region narrower, only a little wider than half the 

 carapace width. The outer margins of the outer orbital teeth 

 anteriorly converge instead of diverge, as in aculeata. Carapace 

 ornamented with strongly marked tubercles, the larger of which are 

 spinous and are arranged as follows: Two on the median line of the 

 gastric region, the anterior the smaller and sometimes bifid; two 

 placed transversely on the anterior part of the cardiac region; four 

 or five on each branchial region. Of smaller tubercles, there are 

 two on each protogastric lobe, one almost in the same line on the 

 mesogastric region, behind the latter two close together, and two 

 side by side behind the median spine. On the cardiac region there 

 is a curve of three granules in front of the middle and a curve of four 

 behind the middle, the curves subparallel and concave behind. The 

 branchial region has two lines of granules on the posterior half, one- 

 line following the general direction of the postero-lateral margin, the 

 other line shorter, running along the inner boundary of the region, 

 the two lines meeting at an acute angle. There are other granules 

 scattered on the carapace but no conspicuous protuberances on the 

 hepatic region. 



Lobes of rostrum acute, a denticle on their inner margins which is 

 partially superimposed on the lobe. Orbital angles acute or subacute. 

 Antero-lateral teeth five, after the orbital angle, curved, acute, the 

 second smaller than the third and basally joined to it. Carapace 

 widest at the fourth tooth. Fifth tooth nearly as large as second. 



First movable segment of antenna as broad as long, outer lobe not 

 so long as in aculeata. 



In the mature male the chelipeds are a fourth longer than the 

 carapace; palms twice as long as wide, margins subparallel; fingers 

 gaping for half their length, a large tooth on dactyl in the gape. 



The appendages of the first segment of the male abdomen are so 

 disposed as to form together in their distal half a lyre-shaped figure. 



Color. — Whitish (Saussure) . 



Measurements.— Male (50654), length of carapace 19.4, width of 

 same 17.2 mm. Male (2098), length of carapace 23, width 21.4 mm. 



