102 NEW INVEETEBRATA FROM 



distal end the spadix is enlarged into a disk-shaped struct- 

 ure, and about midway in its length there arise lateral 

 branches from which originate the spermatic masses. The 

 proximal part of the spadix is connected with the inner 

 wall of the male capsule by a network of fibres represented 

 in fig. 3. At the distal end of the same organ the walls 

 of the spadix and those of the capsule are similarly united. 

 Spermatic elements are formed inside the sporosac and are 

 developed from the external walls of the spadix, probably 

 making their way out through an opening in the distal end 

 of the sporosac. The female Atractyloides was not ob- 

 served. 



PERIGONIMUS FORMOSUS sp. nov. 



A Perigonimus, which resembles P. serpens All man, 

 was taken at Santa Cruz. 



Stem small, creeping, sending up at intervals small, 

 chestnut-colored tubes. No hydrothecal enlargement. 

 Stems simple, branching, slightly annulated. 



Polypites with reddish-yellow hydranths, each with from 

 ten to sixteen tentacles and a prominent circumoral knob. 

 External walls covered with unicellular algae. Tentacular 

 nematocysts prominent. 



The gonosac arises from the creeping stalk and is a cap- 

 sular body found in numbers in different regions of the 

 colony. The ovisac forms at the extremity of a simple 

 tube not unlike that which bears the hydranth. This tube 

 is slightly annulated and at its distal extremity is enlarged 

 into a spherical body of dark crimson color enclosed in a 

 transparent sac. 



The mode of formation of the ovisac separates this spe- 

 cies of Perigonimus from others which have been de- 

 scribed. No medusa was observed and the color is very 

 different from P. serpens. 



It is believed that the ovum after segmentation devel- 



