ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 41 



a single character, namely the presence of anal teeth in the former and 

 the absence of these structures in the latter. He finds reason to unite 

 the genera under the title Holothuria, with five sub-genera. Of these 

 the old genus Holothuria includes three — Bohadschia, Halodeima, and 

 Thymosicya, and the old genus Mulleria two — Actinopyga and Argiodia. 

 The number and arrangement of the tentacles, Polian vesicles, and 

 stone canals are variable characters even within the limits of a single 

 species. This is also true of the Cuvierian organs. There are only four 

 characters of any taxonomic value in the genus. These are (1) the 

 arrangement of the ambulacral appendages : (2) the nature of the 

 spicules ; (8) the presence or absence of anal teeth ; and (4) the structure 

 of the calcareous ring. With reference to these — the calcareous ring- 

 primarily — Pearson classifies the sub-genera. He also deals with the 

 numerous Indian Ocean species of Holothuria* including two new 

 species, and with the Indian Ocean species of Argiodia\ and Actinopyga. 

 Diagnoses and figures of the calcareous corpuscles are given. 



Coelentera. 



New Alcyonarian Genus. J — S. F. Light describes Lemnalioides 

 Tcukenthali g.etsp. n. from the Philippines. The colony is upright, 

 tree-like, or bushy, and consists of a number of stems coalesced in one 

 or more groups for some distance above the base. The tubular, non- 

 tractile polyps are scattered singly or in little groups on the branches 

 and lateral and terminal twigs. The spiculation of the cortex and the 

 canal walls is similar to that in Lemnalia. The tentacles contain a very 

 few very small scattered spicules, and the stomodaaum contains no 

 spicules. The tentacles bear more than one row of pinnules and show a 

 median longitudinal band of muscle-fibres on their outer surfaces. 



The author emends the diagnosis of the genus Lemnalia, from which 

 the new genus then differs in that the tentacles contain very few spicules 

 and the stomadaeum none, and in that there is a double row of pinnules 

 on each side of the tentacles. The new genus is intermediate between 

 Lemnalia and Lithophytum, but is much nearer the former. It differs 

 from Paralemnalia most distinctly in its more tree-like colony form, in 

 that the polyps are sometimes arranged in little groups and are borne 

 on the branches and twigs, in the absence of stomodaeal spicules, and in 

 the scarcity of spicules in the tentacles. It is suggested that Para- 

 lemnalia, Lemnalia, and Lemnalioides, might be ranked us a sub-family 

 Lemnaliinte within the family Nephthyidse. 



Philippine Scyphomedusae.§ — S. F. Light describes a number of 

 interesting new forms. He establishes a- new Rhizostomatoiis genus 

 Acromitus, which is most closely related to Catostglus, and less closelj 

 to Lychnorhiza and Crambione. He emends the generic characters of 

 Lobonema Mayer, and places near it a new genus Lobonemoides. 



* Spolia Zeylanica, ix. (1914) pp. 49-101 (10 pis.). 



t Spolia Zeylanica, ix. (1914) pp. 173-90. 



X Philippine Journ. Sci., ix. (1914) pp. 233-45 (1 pi. and 8 figs.). 



^Philippine Journ. Sci., ix. (1914) pp. 195-231 (16 figs.). 



