LARVAE OF DECAPOD CRUSTACEA 387 



This species differs from S. hispidus as follows : 



( 1 ) The rostrum bears a series of small teeth towards the end. 



(2) Supra-orbital spine longer and straighter. 



(3) Pleural spine of abdominal somite 3 very long and straight, overlapping the 

 carapace. 



(4) Somite 4 with very small pleural spines. 



(5) Pleural spine of somite 6 very small. 



The remaining six forms cannot be separated into generic groups. It is quite possible 

 that all may belong to the genus Spongicola, but the best course seems to be to describe 

 them simply as problematical members of the family Stenopidae. 



Stenopid I (Fig. 6) 

 Sts. 709, 1575, 1578; 'Atlantis' St. 1121. 

 Stage V ?. Length 57 mm., including rostrum 0-45 mm. 



a. Side view. 



b. Maxillule. 



Fig. 6. Stenopid I. St 709. 

 c. Maxilla (setae of endopod broken oflf). 



d. Maxillipede i. 



