ACADEMY OF SCIENCES. 75 



27. Oregonia hirta. Dana. U. S. Ex. Exp., I, 107, pi. Ill, f. 3. Stimp- 



son. Crust, and Ecbi. Pac. S. N. A. 



Both the Oregonlce are found in deep water. Locality, Puget Sound. I 

 have not seen either of these species. 



28. Leptopodia debilis. S. I. Smith. Rep. Peabody Acad. Sci., 18G9. 



Panama, Pearl Islands. 

 A single specimen of this species was found in Mr. Fisher's collection, from 

 the Gulf Coast of Lower California. 



29. Inachoides ( Microrhgnchus) Hemphillii. Lockington. Proc. Cal. Acad. 



Sci., February 7, 1876. 



I have been in some doubt whether to refer this species to Inachoides or 

 Microrhynchus, but as the eyes are tolerably elongated and do not appear to be 

 retractile within the small orbits, I prefer the former. On the other hand, it 

 differs from both genera in the absence of a post-orbital spine, unless a single 

 spine on the antero-lateral margin, situated almost the length of the rostrum 

 behind the eyes, can have a right to that name. The rostrum is one-fourth 

 the length of the posterior portion of the carapax. The want of a post-orbital 

 spine scarcely warrants the establishment of a new genus, but the definition 

 of the genus Inachoides must, to admit it, be altered slightly, thus — 



Inachoides. Edwds and Lucas. Carapax ralde gibbosus rosiro longiusculo, 

 acuto, spina post-orbitali parva aut nulla. Pedes 8, postici sat longi, gracillimi. 

 Articalus antennarum externarum Imus angustus. 



The words aut nulla admit the present species. Localities — San Diego, San 

 Lixis Obispo, both in Upper California; La Paz, where it has been dredged 

 from a bottom of sand and mud; San Jose Island; Amortiguado Bay; Port 

 Escondido; Mulege Bay- all in the Gulf of California. The largest specimen 

 I have seen, a male, exceeds in size the type in the possession of the Acad- 

 emy. The dimensions are as follows: j 



M. M. 



Length of carapax, including rostrum 34 



Greatest width of ditto 13 



Length of first pair 40 



Length of second pair 70 



One of the largest females measures 15 m. m. in length and 8 in width. The 

 carapax of this species is free from the parasitic growth, often so abundant on 

 maioid crabs. 



No. 2. Male, San Diego, 7 fms. Hy. Hemphill. 



30. Inachoides brevirostrum. nov. sp. 



Carapax pyriform, the regions in the central line of the body more elevated 

 than the lateral regions. Rostrum short, simple, consisting of the spinous 

 termination of the septum dividing the fossettes of the inner antennas. Op- 

 posite the anterior extremity of each fossette an acute tooth, so that the ros- 



