HYDROIDS. 843 



20. Aglaophenia delicatula (Busk) sub.-sp. (12, p. 396; 7, p. 1(J7). 



This Maldive form differs from the type in that the side nematothecae are shorter and 

 stouter and the side teeth of the hydrothecae rather better marked. 



The corbulae of this species have hitherto been unknown. They are present in the 

 specimen and are " open," consisting of hydrocladia bearing gonophores arched over by long 

 alternate branches, each bearing a double row of nematophores. 



Dredged in S. Nilandu Atoll in 25 fathoms. 



21. Aglaophenia maldivensis n. sp. (PI. LXIX. fig. 8.) 



Definition : An Aglaophenia which has an iiTegularly branched stem and hydrocladia on 

 all the branches but not on the stem below the branches; the hydrothecae with a wide 

 mouth opening forwards, in the middle of the free side a strong, curved tooth and above 

 this on each side three lower, wider teeth ; the middle nematotheca falling far short of the 

 mouth of the hydrotheca, free for about a third of its length, and having a rather narrow 

 opening ; the intrathecal septum nearly transverse to the hollow of the hydrotheca at its 

 point of origin, which is about at the level at which the middle nematotheca becomes free ; 

 the side nematotheca flask-shaped ; and the corbula egg-shaped, made up of six broad, al- 

 ternate plates with openings between their notched edges. 



Taken on the reef at Hulule, Male Atoll. 



22. Aglaophenia schneideri n. sp. (PI. LXIX. fig. 9.) 



Definition: An Aglaophenia with the stem unbranched (?) ; the hydrothecae opening 

 somewhat forwards, the opening of each with a strong, curved, crested tooth in the middle, 

 and two shorter, weaker teeth at each side, the first of these being sundered by a wide, 

 deep gap from the middle tooth ; the intrathecal septum slanting ; the middle nematotheca 

 not nearly reaching the mouth of the hydrotheca, wide mouthed, free for a short distance only. 



I have called this species after Prof C. Schneider, in gratitude for his masterly handling 

 of the problem of the simplification of the classification of Hydroids. 



Dredged in Miladumadulu Atoll, in 24 fathoms. 



23. Aglaophenia gracillinia n. sp. (PL LXIX. fig. 10.) 



Definition : An Aglaophenia with the hydrocaulus very slender and delicate ; the hydro- 

 thecae far apart, their openings slightly expanded, looking towards the end of the hydrocladium, 

 and guarded by nine, equal, rather narrow teeth ; the middle nematotheca reaching at its end 

 to within about a quarter of the length of the hydrotheca from the opening of the latter, 

 adnate to the hydrotheca for the greater part of its length and widely open at the end ; 

 the side nematophores short, broad, and directed somewhat forwards ; and the intrathecal 

 septum nearly transverse. 



The shape of the hydrothecae somewhat recalls those of A. acacia and A. calamus Allm. 

 (6, I. pp. 38, 39). 



The collection contains only some fragments, dredged in 28 fathoms in Miladumadulu Atoll. 



