246 J- Playfair McMürbich, 



specimen more tlian seemed advisable, but tliey seemed to be solid 

 elevations whose ectoderm was pigmented like tliat of the rest of 

 the column. 



The circular musculatiire of the column was but moderately 

 developed, but there was a strong mesogloeal sphincter (Fig. 28), 

 triangulär in section, tapering off ratlier abruptly at its lower edge 

 and separated from both ectoderm and endoderm by a distinct layer 

 of homogeneous mesogloea. It extended throughout the length of 

 the capitulum and in its upper part presented a reticular appearance, 

 while below it showed distinct indications of layering. 



The tentacles were probably forty-eight in number and were of 

 moderate length and simple, possessing no enlargement of the 

 mesogloea at their bases. Their longitudinal muscles and the radial 

 muscles of the disc were well developed and were not imbedded in 

 the mesogloea ; the ectoderm of both disc and tentacles was destitute 

 of pigment granules and abundantly supplied with both gland cells 

 and nematocysts. The stomatodaenm was long, reaching nearly to 

 the base; its mesogloea was thick and it possessed two well-marked 

 siphonoglyphs, where lower edges were somewhat prolonged. 



The mesenteries were arranged hexamerously in four cycles and 

 only those of the first cycle were perfect. Their longitudinal mus- 

 culature was only moderately developed (Fig. 29), the supporting 

 processes diminishing gradually in height toward either edge while 

 those of the middle portion were more or less branched, often 

 pinnately. In the region occupied by the parieto-basilar muscles the 

 mesogloea was somewhat thickened in the mesenteries of the first 

 and second cycles, and as the thickening ended abruptly where the 

 longitudinal musculature began the parieto-basilar in some cases 

 formed a slight fold upon the surface of the mesentery. Basilar 

 muscles were present but were feeble in proportion to the size of 

 the specimen. The individual mesenteries of each pair were equally 

 developed and all possessed mesenterial fllaments, the ciliated lateral 

 lobes of whicli were very well developed. No reproductive cells 

 were observed nor could I determine the preseuce of mesenterial 

 stomata. 



The specimen, apart from its much greater size and the uni- 

 formity of the coloration of its column, resembles very closely the 

 form I have described (1893) as Paradis lineolata and, indeed, there 

 seem no reasons for doubting its identity with that form. The 

 diflference in coloration may well be associated with the difference 



