264 T. A. STEPHENSON 



tentacles, living in brackish water in India. There is a slight base. 

 Body smooth but for microscopic prominences containing nematocysts. 

 The outer tentacles are the largest. Six pairs of perfect mesenteries. 

 Gonads on the older imperfect mesenteries. No true retractors or 

 sphincter. Tentacles without sphincters. 

 Species : 



N. glauca, Annan., 1915, p. 70. 



It has been necessary to erect a new genus for Annandale's 

 Gyrostoma glancum, which cannot come within the 

 genus Gyrostoma or even into the Actiniidae, with its six 

 pairs of sterile perfect mesenteries and their feeble musculature. 

 It seems to be a distinct ;ind interesting form, which fits into 

 the Myonanthidae well. 



Family 3. Andresiidae, n, fam. 



Ilyanthidae as used by Andres, 1883,' p. 457, pro parte. 



Endomyaria. The only known genus has a body capable of attaining 

 a great length, and devoid of a pedal disc, being adapted for burrowing. 

 Body \vithout verrucae, but with a notched parapet and a fosse at 

 the margin. Tentacles long, retractile, in four regular cycles, graded 

 in size from within outwards. Small circumscribed endodermal sphincter. 

 Longitudinal musculature of tentacles ectodermal. Twenty-four pairs 

 of mesenteries in three cycles, all perfect but in varying degrees, aU 

 fertile save sometimes the directives, and provided with diffuse retrac- 

 tors which are not confined to the larger mesenteries only. 



The above is a short statement of the chief characteristics 

 of the only species as yet referable to this family, A n d r e s i a 

 parthenopea. This form was described by Andres (1883, 

 p. 459) as Ilyanthus parthenopeus , and further dealt 

 with by Faurot (1895, p. 154) and Simon (1892). It is a species 

 which does not conform to one's idea of Athenarian structure 

 at all well, and certainly cannot remain in the genus Ilyan- 

 thus, as represented by I. mitchelli, which I have been 

 able to investigate anatomically. I here suggest the generic 

 name Andresia for it, after Angelo Andres, author of the 

 largest monograph on Actiniaria yet attempted. I have 

 proposed (Part II, p. 522) to have a separate family Andre- 

 siidae for it, liecause it cannot well be placed in any known 



