BRACHYURA AND MACRURA 283 



the inner, the inner pair more advanced and separated from each other 

 by a V-shaped sinus and from those of the outer pair by a U-shaped 

 sinus. The angle on the inner side of the outer of the superior orbital 

 fissures is rather prominent. The tooth at the outer angle of the orbit 

 is equally advanced with the outermost of the eight frontal teeth. Of the 

 antero-lateral spines or teeth, the second, fourth and sixth, are smaller 

 than the others and themselves diminish in the order named ; the first 

 and second are subacute, the rest sharp. The ninth spine (at the 

 lateral angle) is about two and a half times as long as the eighth or 

 preceding spine ; it is directed outward and upward. The inner sub- 

 orbital tooth is produced to the line of the median sinus of the front ; 

 outer sinus small, V-shaped. 



The merus of the chelipeds bears five spines on its anterior margin, 

 of which the proximal one or two are smaller ; posterior margin ter- 

 minating in a small curved spine. Carpus with a small outer spine 

 and a long stout inner spine. Manus with two spines, one near the 

 carpus and one near the distal end of the upper margin. Postero- 

 distal angle of merus of swimming feet armed with a spine. 



Dimensions. — Total length of carapace of a male 13.4 mm., width 

 23, width between last antero-lateral sinuses 1 7.9 ; exorbital width 10.8. 



Type Locality. — Tagus Cove, Albemarle Island, on reef north of 

 Tagus Hill, 2 males, 3 young (U. S. Nat. Museum Cat. No. 34833). 



Affinity. — This species is near Portunus (^Achelous) minimus irova 

 the Gulf of California, but may be distinguished by its more uneven 

 carapace, advanced front, longer lateral spine and the spine on the 

 merus of the swimming feet. 



Family MAIID^. 

 Stenorynchus debilis Smith. 



Tagus Cove, Albemarle Island, i3 fathoms, 2 females. 



Tagus Cove, on reef north of Tagus Hill, March 16, i male, i young 

 female. 



Distribution. — Lower California to Chile, from low water mark to 

 31 fathoms. Not before noticed from the Galapagos. 



PODOCHELA MARGARITARIA sp. nov. 



(PI. XII, fig. 12.) 



Carapace about one and a third times as long as wide. Gastric and 

 cardiac regions very high, each surmounted by a tubercle. Hepatic 

 region with a prominent tubercle projecting downward below the lat- 

 eral line. No postorbital lobe. Front long and hood-shaped, the pos- 



