CETJSTACEA OF THE MEEGITI ARCHIPELAGO. 295 



presents an oblique notcli and another slight emargination is 

 observed near the proximal end of the outer margin of the 

 external urorami. A similar structure is proper to the male of 

 PencGUS a-ffinis, M.-Edw., according to Spence Bate {I. c. p. 179, 

 pi. xii. fig. Qv). In the urorami of the female these notches are 

 quite wanting. 



The "ventral plate " of the female lying between the last two 

 pairs of legs, strange to say, presents a different shape in the two 

 forms of females ; in the females A, in which the ischium-joint of 

 the last pair of legs is triangularly dilated, the ventral plate is 

 divided by three grooves, which meet one another in the centre, 

 into three multangular smaller plates, a median anterior one and 

 two lateral posterior ones. In the two other females, B, the 

 ventral plate is not divided into secondary plates, the radiating 

 grooves not being found in it. 



This species is 60-70 millim. long from the tip of the rostrum 

 to the end of the terminal postabdominal segment. 



FencBUS Lysianassa differs from Penwus Irevicornis, M.-Edw., 

 by its much shorter rostrum, by the longer flagella of the 

 internal antennse, and by many other characters, such as the form 

 of the petasma, &c. 



The Japanese Penceus lamellatus, de Haan, of which I have 

 seen a type specimen from the Leyden Collection, is a quite 

 different species, which may be recognized at first sight by its 

 larger rostrum, armed with more numerous teeth, by its telson 

 being spiniferous along its lateral margins, by the form of its 

 petasma, &c. 



Order STOMATOPODA. 



Grenus Sqtjilla, Dana. 



162. Squilla kepa, Latr. 



Squilla nepa, Latreille, Encyclop. MSthodique, x, p. 4/1 ; Milne- 

 Edwards, Hist. Nat. Crustaces, t. ii. p. 522. 



Squilla oratoriaj de Haan, Fauna Jap., Crustacea, p. 223, pi. Is. fig. 2. 



Squilla nepa, Miers, On the SquillidcB, Ann. Sj- Mag. Nat. Hist. 

 Jan. 1880, p. 25, pi. ii. fig. 13. 



One specimen was collected in King Island Bay. 

 Some time ago, while in Leydeo, I was able to compare a 

 typical specimen of Squilla Icevis, Hess, presented to the 



