of the Virginian Coast. 



221 



SPH^ROS^LLIS apd, 

 SPHiERbsYLLIS FORTUITA 71. SJ>, 

 PL. IV. FIGS. 44-48. 



Head oval, slightly convex, length to breadth as 1 to 2 

 (f. 44). Ejes four, large, oval ; anterior pair at posterior 

 third of the head, lateral; posterior pair just within and 

 but little back of the anterior. 



Antennae fusiform, equal, two-thirds as long as head 

 and palpi taken together. The unpaired antenna originates 

 between the posterior eyes ; the lateral just in front of the 

 anterior eyes. The palpi are large, rounded externally, 

 bluntly rounded in front, united along their inner two- 

 thirds, outer third free, but not diverging. There is a 

 wide and deep depression between the palpi, exteriding 

 from the head to the free portion. 



First segment narrow, but perfectly distinct from the 

 head. 



Tentacular cirri similar in all respects to the antennae. 



Dorsal cirri, a-trifle shorter than the antennae, and not 

 quite so much enlarged at base, especially on the posterior 

 segments. 



The anal cirri are double the length of the dorsal cirri, 

 constricted at base ; their diameter increases slightly along 

 their inner half, when they are somewhat suddenly con- 

 stricted, the outer half having about one-half the greatest 

 diameter of the basal half (f. 45). 



Ventral cirri, arise from base of feet, delicate, cylindrical, 

 in front as long as the feet, longer behind and turned back- 

 ward on a few of the posterior segments. 



Feet very stout, cylindrical, bilabiate. The oesophagus 

 reaches to the middle of the 5th segment. The stomach 

 barely reaches into the 7th. The oesophagus has a cov- 

 Trans. ix.] 29 



