376 DE. W. M. TATTERSALL ON THE STOMATOPODA AND 



large chela (the left one in this case), which ends anteriorly in a sharp spine 

 directed straight forward. In S. biunguiculatus the palm ends anteriorly in 

 a bluntly rounded tubercle. The dactylus of the smaller chela is without a 

 dorsal brush of hairs. The merus of the third legs is four times as long as 

 wide, with three or four movable spinules on the distal third of its lower 

 margin. In this character it resembles S. pacliymeris, Cout. The carpus of 

 these limbs has a single spine on the distal corner of the lower margin and 

 the propodus bears seven or eight spinules. 



The species differs from S. biunguiculatus in the form of the large chela 

 and in having spinules on the merus of the third legs. In the latter 

 character it agrees with S. pacliymeris, but differs from this species in the 

 rostrum and large chela. 



The specimen was infected by an abdominal Bopyrid. 



Distribution. S. savignyi does not appear to have been seen since it was 

 originally described and figured by Audouin and Savigny. Its rediscovery 

 is therefore a matter of considerable interest. Savigny's specimen probably 

 came from the Red Sea though no precise locality is given. 



Synalphevs quinquedens, n. sp. (PI. 28. figs. 1-5.) 



Localities. Station I. D, 1 ? , 18 mm. Station V. E, 1 ? with eggs, 

 20 mm. Station VI., 1 ? , 1G mm. Station VII. F, L ? , 19 mm. 



Uncertain. 1 J 1 , 13 mm., 1 ?, ovig., 13 mm., labelled "part of the 

 fauna of two dead valves of M. margaritifera which were covered by sponges 

 and supported a regular microcosmos of life." 



Description. A. new species of the hiunguiculahis group, belonging to that 

 section of the group characterized by having the posterior margin of the 

 sixth abdominal somite armed with teeth. In S. quinquedens, tho posterior 

 margin of the sixth abdominal somite is armed with a prominent obtuse 

 spine or tooth at each lateral corner and between them, three other smaller 

 blunt teeth more or less equidistantly placed (PI. 28 fig. 5). 



The general form of the body is robust and tumid, and there are a few 

 very scattered quite short hairs or. the carapace and abdomen. 



The three prongs or spines of the rostral plate (PI. 28. fig. 1) are equal in 

 length and extend forward about half-way along the basal joint of the 

 antennular peduncle. The central spine is narrower than the laterals, of 

 more or less equal width throughout. The lateral spines are broad and 

 obtuse. Each of the rostral spines is tipped by a few short setae. 



The antennular peduncle (PI. 28. fig. 1) has the third joint shorter than 

 the second and the stylocerite slightly longer than the basal joint. 



The carpocerite (PI. 28. fig. 1) is five times as long as wide, and projects 

 beyond the antennular peduncle by about one-sixth of its length. The 

 terminal spine of the scaphocerite is equal to or slightly shorter than the 



