REPORT ON THE CRUSTACEA MACRURA. 549 



First pair of pereiopoda having the right hand very long, thick, smooth, and pear- 

 shaped, tapering towards the dactylos. The pollex is shorter than the dactylos which 

 is curved and obtusely pointed, the entire hand being about two-thirds the length of 

 the animal. 



Female. Male. 



Length, entire, ... 18 mm. (0-7 in.). 11 mm. (04 in.). 



„ of carapace, . . 6 ,, 4 „ 



„ ofpleon, . . . 12 „ 7 „ 



„ of telson, ... 2-5 „ U5 „ 



„ of large chela, . . G „ 6'5 „ 



Habitat. — Samboangan, Philippine Islands ; reefs. One specimen, male. 

 Station 208. — January 17, 1875 ; lat. 11° 37' N., long. 123° 31' E. ; off Manila ; 

 depth, 18 fathoms ; bottom, blue mud. One specimen, female. Trawled. 



Observations. — The specimen taken at Station 208 was a female, in which the 

 large hand was relatively small ; it was laden with ova of a pale yellow or lemon 

 colour, and was associated with a specimen of Alpheus spiniger (Stimpson). 



It corresponds very closely in general appearance with Alpheus minus, Say, but it 

 has no tooth on the orbital lobes. However, if Kingsley be correct (and I think we 

 require more extensive experience in our knowledge of these animals before deciding) in 

 determining that these orbital teeth are of no specific value, the separation of this form 

 from Alpheus minus becomes more difficult. It has, however, a more robust carpos and 

 propodos on the third and fourth pairs of pereiopoda, carries a tooth on the under or 

 posterior angle of the meros, has the propodos fringed with long spines, and the dactylos 

 tipped with a small secondary unguis. 



Alpheus leviusculus, var., Dana (PI. XCVIII. fig. 1). 



Alpheus edwardsii, var. leviusculus, Dana, U.S. Explor. Exped., Crust., p. 543, pi. xxxiv. fig. 3. 



Carapace about one -third the length of the animal ; anterior dorsal surface elevated 

 over the gastric region, and produced anteriorly to a rostrum that is separated from the 

 orbital lobes by a slight longitudinal groove. Orbital lobes without a tooth, but the 

 angle on the inner side projects slightly, so that when held in some positions there 

 appears to be a small tooth. 



First pair of antennas pubescent and having the second joint twice the length of 

 the first, the stylocerite broad, flat, pointed, and as long as the first joint. Flagella 

 subequal ; the inner, which is the more slender, is about as long as the carapace. 



The second pair has a scaphoeerite that is rather longer than the peduncle, and 

 terminates in a sharp point which is separated for a short distance from the foliaceous 

 portion. 



