520 The American Naturalist. [June, 



tary rudiments of other tentacles as thickenings of the umbrella 

 margin. — Genera: 1, Conis; 2, Tiara, Hydroid, Campaniclaval ; 3, 

 Turris, Hydroid, Clavula ; 4, Catablema. 



B. Pycnomerinthia. Tentacles solid ; filled with large entoderm cells. 

 a. Monerenemata. With simple separate tentacles. 



6. Dendroclavid^:. With sessile nematophores on the margin of 

 the mouth — Genus Turritopsis, Hydroid, Dendroclava. 



7. Podocorynid;e. With short oral tubes and stalked nematophores 

 on the mouth margin — Genera: 1, Oytceis; 2, .Thamnitis ; 3, Cubo- 

 gaiter; 4, Dysmorphosa (including Cytceandra), Hydroid, Podoco 



8. Thamnostomidje. Oral tube elongate, surpassing the stalked 

 nettle clusters. — Genera, 1, Thamnostylis ; 2, Thamnostoma; 3, Lim- 



/?. Lophonemata. Tentacles simple, in bunches. 



9. Bougainvilleid.e 1 . With stalked nematophores on oral margin. 

 — Genera: 1, Margelis; 2, Hippocrene (including Nemopsis) ; 3, 

 Bathkea. 



y. Cladonemata. With compound, feathered or branched tentacles. 



10. Pteronemid.e. Tentacles feathered. — Genera : Pteronema ; 

 Ctenaria; Zanelea; Gemmaria. 



11. Dendronemidje. With branched tentacles— Genera : 1, Cla- 

 donema (including Dendronema) ; 2, Eleutheria. 



Free-Swimming Sporocysts. 2 — M. Braun has studied "free- 

 swimming sporocysts " similar to those described by Prof. Wright, 3 only 

 larger, — 6 mm. long. They are shaped like a T and in the stem of 

 the T a distorted Distomum was visible. Thus these apparently free- 

 swimming sporocysts are enormously developed Cercarise, closely 

 allied to C. macrocerca and cystophora, except in furcocercal form. 

 They apparently come from Limnceus palustris var. corvus. Feeding 

 experiments were not successful in determining the final host. 



Peripatus leuckartii Oviparous. 4 — Dr. Arthur Dendy thinks 

 he has evidence to show that Peripatus leuckartii, unlike the rest of its 

 congeners, lays eggs. He had one male and three females of the 



^Lizusa, Lizzia, Lizzella and Margellium are included as young forms which can 



2 Zool. Anz., xiv, 368, 1891. 



*Zool. Anz., xiv, 146, 1891. 



