762 DESCRIPTION OF SOME NEW AUSTRALIAN DECAPODA, 



26. Gretna spinifrons, sp. n. 

 Front divided into three parts by two deep lateral longitudinal 

 grooves, which extend on the upper surface of the carapace, 

 becoming shallower posteriorly and bending slightly outwards ; 

 the mesial portion of the front much more prominent than the 

 lateral portions, and forming a triangular rostrum with a narrow 

 mesial longitudinal groove above ; lateral portions each with two 

 small acute teeth below near their extremity ; cephalic region of 

 the carapace marked with numerous transverse scabrous lines 

 beset with hairs; anterior border, below the lateral frontal 

 process, and behind the base of the antenna?, with three prominent 

 acute spines ; two others on the outer portion of the antennary 

 sternum ; three smaller close together in a longitudinal row on 

 the hepatic region parallel with and close below the lateral 

 border ; and a row of 2-10 others bordering the lateral portions 

 of the cervical groove behind. First three pairs of legs having 

 the merus armed below with a variable number of acute spines ; 

 first pair also armed with a row of spines on the upper border of 

 the propodos and carpus, and a single spine on the upper border 

 of the merus near the distal extremity ; second pair with a single 

 spine on the upper border of the carpus, and two near the distal 

 end of the upper border of the merus. Length 3 in. 



Port Stephens, eight fathoms. 



27. Alpheus Comatularum, sp. n. 

 Carapace broad, somewhat depressed. Eostrum very long, 

 one-third of the length of the carapace, slender and acute, con- 

 tinued backwards over a third of the length of the carapace as 

 an acute, prominent, arched crest. A prominent, acute supra- 

 orbital spine more than one-third of the length of the rostrum. 

 External antenna? with two acute spines at its base, the outer 

 very large. Basal spine of internal antenna? long, acute. Pro- 

 podos of large hand swollen, smooth ; immobile finger nearly 

 straight, with a hairy protuberance at the base of its inner border; 



