2 PEOCEEDIXGS OF THE XATIOXAL MUSEUM vol. 75 



Caloxanthus A. Milne Edwards,^ a Cretaceous genus in France, 

 type C. formosus A. Milne Edwards,^ has a form and rough surface 

 similar to those of Ocalina, but the front is straight and undivided, 

 the circular orbit has a small inner gap, the basal article of the 

 antenna reaches tlie front, the chelipeds are as rough as the carapace. 



OCALINA FLORIDANA, new species 



Plates 1-3 



Description of Jiolofi/pe. — Carapace broadly suboval. very convex, 

 more so longitudinally than transversely, antero-lateral margin a 

 little longer than postero-lateral margin. Front more than one- 

 third width of carapace, orbit subcircular. Antero-lateral margin 

 with ten thick, similar, closely placed lobules, including that at outer 

 end of orbit. Dorsal surface rough except in the middle or meso- 

 gastric region with Ioav conical tubercles which are largest about the 

 anterior and antero-lateral regions, smallest and more or less coales- 

 cent across the posterior third of the carapace, highest and most 

 acute near the lateral angle (see also paratype c). Surface punc- 

 tate, especially between tubercles, punctae visible to the naked eye. 

 Orbit circular, closed, ornamented above with ten or eleven tuber- 

 cles, all small, except those at inner and outer angles; below four 

 low tubercles. Basal article of antenna obliquely-transversely 

 placed, its extremity at a considerable distance from the orbit 

 (paratype h). The broad front is most prominent near the middle 

 and has a deep median V-shaped emargination; each half is sub- 

 divided into two lobes; the inner lobe is triangular, its edge shallow- 

 trilobulate or tuberculate; the outer lobe is transverse and bilobu- 

 late; in the sinus between the lobes there is a lobule. 



Paratype a shows part of the ventral surface of the body and 

 appendages of a male. The sternum, abdomen, and lower surface 

 of carapace are smooth and punctate. The outer maxilliped resem- 

 bles that of (JarpUhis. The left one is preserved but is detached 

 and turned at a right angle to its normal position; the merus is 

 also bent at an acute angle with the ischium. The ischium is longer 

 than broad, the merus is broader than long and widens inwardly, 

 inner margin angled; exognath broad and long, reaching end of 

 merus of endognath. Merus of ambulatory legs broad, compressed. 

 The fourth, fifth, and sixth segments of the male abdomen are each 

 broader than long; the fifth twice as broad as long, the sixth longer, 

 the fourth still longer ; the cavity formei-ly occupied by the terminal 

 segment shows it to have been triangular and more than half as 

 long as broad. 



*Ann. Sci. Nat., Zool., Ser. 4, vol. 20. 1863, p. 282; ser. 5, vol. 1, 1864, p. 43. 

 "5 Idem. vol. 20, 1863, p. .•?26. pi. 0. figs. 1-ld : ser. 5. vol. 1, 1864, p. 44. 



