rgai.] S. Kemp & B. Chopra : Stomatopoda. 305 



The mandibular palp, which in S. miilticarinala is composed 

 of three segments, is entirely absent. 



The oblique carina on the outer side of the merus of the 

 raptorial claw in S. miilticarinata is represented in .S. lirafa merely 

 by a slight swelling. The dactylus has six teeth (including the 

 terminal one), whereas in 5. multicarinata there are only five.' 

 As in the related species the first four thoracic limbs are provided 

 with epipods. 



The lateral processes of the exposed thoracic somites are 

 closely similar in the two species, but the anterior process of the 

 seventh somite is more produced in 5. liraia. In the carination of 

 these somites there are marked differences. In .S. imiUicarinata 

 there are clear cut continuous transverse carinae on either side of the 

 fifth somite^ whereas in S. lirata there are merely irregular 

 tubercles. The longitudinal carinae on the three posterior thor- 

 acic somites are similar in the two species, but in 5. lirata tend to 

 be broken up into tubercles laterally and whereas in .S'. nmlticari- 

 )iata practically all the carinae terminate posteriori}' in spines, 

 only one pair of spines, those terminating the submedian carinae, 

 are to be foun^l in S. lirata. 



As in S. multicarinata there are numerous carinae on the 

 abdominal somites, but at the sides, especially' between the inter- 

 mediate and lateral carinae they are frequently broken up into 

 tubercles and short ridges which are often not strictly longitudinal 

 in direction. Between the submedian carinae on the first two 

 abdominal somites only three additional keels are to be found 

 in place of the five which are constantly present in 5. multicari- 

 nata. 



The formula for the spines on the abdominal somites is as 

 follows : — 



Carinae. 



Submedian 

 Intermediate 

 Lateral 

 Marginal 



In S. multicarinata the lateral carinae of the first two somites 

 and the marginal carinae of the first one, two, or three somites do not 

 end in spines. In S. multicarinata all the subsidiary carinae be- 

 tween the intermediates end in spines; in S. lirata the only carina 

 in addition to those mentioned in the above formula which ends 

 in a spine is one situated immediately on the inner side of the 

 intermediates of the fourth and fifth somites (text-fig. 4) and 

 even this spine is not always well developed. On the last abdo- 

 minal somite there are only a few obscure tubercles in place of 

 a continuous carina between the median and submedian carinae, 



' Miers found seven teeth on one dactylus of a specimen from the Philippine 

 Is. The additional teeth in this individual were perhaps formed subsequent to an 

 injury, for five are uniformly present in the ten specimens we have examined. 



