IIEXAPATHES IIETEROSTICIIA. 



233 



their arrangement can be made out. The spines on the anterior side 

 of the axis (polyp-bearing side) are conical, laterally compressed and 

 more or less turned upwards, while those on the posterior side are 

 usually not so tall as those on the anterior side and stand perpen- 

 dicularly to the axis. The anterior spines measure 0.05-0. 10. mm., the 

 posterior ones not more than 0.07 mm. in height. 



As to the soft parts, the polyps are arranged on the anterior side 

 of both the stem and branchlets in an uuiserial manner. They are large, 

 and their transverse axis is longer than the sagittal, being elongated 

 to a length of 5-9. mm. (usually 7 mm.). The median portion of polyps 

 ( := gastrozooid of Brook) is provided with a high cylindrical projection 

 of peristome, the tentacles being given off at about the level of the 

 lower end of the long stomodanim (which almost reaches the axis sheath). 

 With regard to the mesenteries there exist only two pairs of 

 directives and a pair of laterals. Even in the upper parts of the 

 peristomal projection, no other mesenteries are found. 



The entoderm and mesoglcea are found very much contracted in 

 the specimen 1 , while the ectoderm remains in a distended state, leaving 

 a wide space between the mesoglcea and the ectoderm. The ectoderm 

 has batteries of very large nematocysts, the largest of these reaching 

 to a length of 40/i. The mesoglœa is poorly developed, containing 

 no stellate cells, such as were described by Brook from Cladopathes 

 piumosa. The other specimens agree very well in their salient 

 features with the type specimen above described. 



As is obvious from the foregoing description, the new form 

 cannot be referred to any of the known genera. Between this form and 

 Cladopathes piumosa, the only hitherto known species of Cladopathime, 

 there exists no similarity respecting the mode of branching — the latter 

 species being characterized by irregular pinnules which are very probably 

 to be homologized with the pinnules of other genera, such as 

 Schizopathes. It is interesting to note that Bathypathes contains a 



1) The specimen has been kept in formalin. 



