Miscellaneous. 265 



occupied, the author suggests Gegeneophis for the genus in the 

 event of its proving to be well founded. Urceotyphlus has. the ten- 

 tacular pit circular and the base of the cultrate tentacle at the 

 bottom of the tentacular tube. It includes two East-Indian species — 

 Ccecilia oxyura, Dum. & Bibr., and C. malabariea, Beddome. The 

 genus Ccecilia, as restricted, includes seven American species — 

 namely, C. tentaculata, Linn., isthmica, Cope, gracilis, Shaw, pachy- 

 nema, Giinth., ochrocephulu, Cope, poly zona, Pisch. (sp. n.), and Gun- 

 theri, sp. n. (=C. rostrata, Giinth. non Cuv.). Hypogeophis has the 

 eye visible ; the species referred to it are Ccecilia rostrata, Cuv., from 

 the Seychelles, and C. Seraphim, Dum., from Gaboon and the Cama- 

 roons. Dermophis includes scaled species, which have been referred 

 by previous authors to Wagler's genus Siphonops, founded upon the 

 sealeless Ccecilia annulata, Hikan. Prof. Peters refers to Dermophis 

 the American species Siphonops mexicanus, Dum. & Bibr.,$. brasili- 

 ensis, Liitken, S. proximus, Cope, and S. simus, Cope, and the West- 

 African S. brevirostris, Pet., and S. thomensis, Bocage. Gymnopis 

 closely approaches Siphonops in the structure of the skull. To this 

 •genus three American species are referred — namely, G. multiplicata. 

 Pet., Bhinutremu unicolor, Dum., and Siphonops oligozona, Cope. 

 Herpele, which approaches Ccecilia in cranial structure, includes only 

 one species, the West-African Ccecilia scpialostoma, Stutchbury. In 

 Chthonerpeton the tentacular pit is placed midway between eye and 

 nostril, but considerably below the line joining those organs ; the 

 only known species is Siphonops indistinctus, Beinh. & Liitk., from 

 South America. The sole representative of the restricted genus 

 Siphonops is Wagler's type species C. annulata, Mikan, from Brazil, 

 Guiana, and Peru. Lastly, in Typhlonectes the eyes are distinct, 

 and the anal aperture surrounded by a sort of sucking-disk. The 

 species are all from South America — namely, Ccecilia co'mpressicauda, 

 Dum. & Bibr., C. dorsalis, Pet., C. nutans, Pisch., and ? Siphonops 

 syntremus, Cope. The foetal form has vesicular branchia?. Prof. 

 Peters's paper is illustrated with a plate elucidating the characters 

 of the genera. — Monatsb. Akad. Wiss. Berl., November 1879, 

 p. 924. 



Histology, Development, and Origin of the Testis and Ovary in Cain- 

 panularia angulata (HincJcs). By M. J. Fraipont. 



The histological study of the three layers, ectoderm, intermediate 

 lamella, and entoderm, of the body in Hydroids, leads to some new 

 and important facts, of which a summary is here given. 



The small nematocvsts of the ectoderm of the tentacles are sur- 

 rounded by a slight protoplasmic layer, often nuclcolated and indi- 

 vidualized, to which a palpocil corresponds. This relation is im- 

 portant from the physiological point of view, and that of the mode 

 of action of the urticant organs. 



The endoderm of the stolons in the vicinity of the pedicles of 

 female gonangia (Campanidaria angulata), and especially in the 

 branches (C. Jlcxitosa), contains larger cells, having, on the one hand. 



