Hapvpon—The Actiniaria of Torres Straits. 447 
family ; so there is no reason why I should enter into a tedious disquisition on the 
subject. 
Simon (‘Beitrag zur Anat. und Syst. der Hexactinien,” Dissertation, Miinchen, 
1892) recognizes two sub-families : 
ArpTastin®, with an endodermal sphincter, or none at all. 
SaGaRTUNa, with a strong mesoglceal sphincter; among the latter he 
distinguishes between the Sagartians without, and the Phellians 
with, a cuticle. 
Carlgren divides the family into three sub-families : 
SAGARTUONA with the renera Sagartia C vlista Ge »hyra and Cereus. 
’) g fo) ) My ) ] ) 
MerripiIIn& with Adamsia Metridium Ai stasia Stelidiactis and Calliactis. 
) d ) | d d 
Puetitun”®, with Chondractinia, Hormathia, Chitonactis, Actinauge, Phellia, 
and Kodioides (?). 
Kwietniewski does not give a classification, but he adopts the Phelliine, and 
accepts M*Murrich’s (1889) definition: ‘‘ Sagartiide, with a cuticular covering to 
a body-wall.” 
It appears to me that at present we may adopt some such arrangement as 
follows: 
AIPTASIINA. PHELLUNZ. 
SAGARTIINA. Merripimn2. 
CHONDRACTINIIN &. 
Of these five sub-families, the first is sharply separated by the character of the 
sphincter muscle from the remaining four, which constitute a group by 
themselves. 
Sub-Family.—Arrrasuna, Simon. 
Sagartiidz, in which the sphincter muscle is either absent or very feebly 
developed and mesoglceal, or diffuse and endodermal. 
Aiptasia, Gosse, 1860. 
Aiptasiinz, with an extensile soft body, cinclides arranged in from one to 
several horizontal rows around the middle of the column; no verrucz or tubercles ; 
tentacles strongly entacmzous; sphincter muscle either absent or very feebly 
developed and mesogloeal, or diffuse and endodermal. 
M*Murrich states, that there is no trace of any sphincter muscle in A‘pfasia 
