366 t)R. W. M. TAl'TERSALL ON THE S'fOMATOPObA AND 



The last two records given above must be considered as doubtful. The 

 young male, 27 mm. long, from Suez, differs from adult specimens in having 

 a shorter rostrum, which only reaches to the level of the anterior end of the 

 eyes, and in the want of a notch on the merus of the last thoracic legs. 

 The latter are without exopod. The petasma is symmetrical, but the two 

 portions are still free from one another. In its other characters it seems to 

 agree with P. stebkingi. The specimens from the stomach of a Ray are all 

 young and not in good preservation, but appear to belong to this species as 

 nearly as it is possible to decide. 



P. stebbingi has not been met with outside the Red Sea, from which Nobili 

 records specimens taken at Suez. It would appear to be an abundant species 

 in the neighbourhood of the latter town. 



Pen^opsis steidulans ( Wood-Mason). 



See Alcock, 1906, p. 27, pi. 5. figs. 14, Ua-d; and De Man, 1911a, p. 65, pi. 7. 

 figs. 20 a-b. 



Locality. Station VIII. A, 2 $ , 50 and 55 mm. 



Remarks. According to De Man, P. stridulans shows a considerable 

 amount of variation in the form of the thelycum, the carinse on the third 

 abdominal segment, and in the form of the stridulating organ, among other 

 characters. These two specimens agree with the account given bj T Alcock 

 and would appear to be typical specimens of the species. 



Not previously recorded from the Red Sea, though it is quite possible 

 that Paulson's record of P. velutinus may refer to this species or the next. 



Pen^eopsis vaillanti (JVobili). (PI. 27. fig. 12.) 



Metapenceus vaillanti, Nobili, 1904, p. 229. 



„ 1906 «, p. 18, pi. 1. fig. 4. 

 „ „ Alcock, 1906, p. 50. 



„ „ De Man, 1911 a, pp. 9 and 54. 



Locality. Station VIII. A, 1 <J , 52 mm., and 2 ? , 49 and 55 mm. 



Remarks. This species belongs to the velutinus group, characterized by the 

 tomentum of the body, the possession of exopods on all the thoracic legs, 

 the absence of a notch on the last pair of legs in the male, the presence of 

 long stout movable spines on the telson, and the asymmetrical form of the 

 petasma. 



As in most species it is mainly distinguished by the form of the thelycum 

 and petasma and, as Nobili's figure of the former is somewhat too diagram- 

 matic, I reproduce one here (PL 27. fig. 12). 



Recorded from Suez and other places in the Red Sea by Nobili, but not 

 known as yet from waters outside that area. 



