THE COAST OF CALIFOKNIA. . 119 



finger-like extension, at right angles to the axis of the 

 knob. 



The sacculus has thickened walls, and is a cylindrical 

 body with a single turn, closely studded with nematocysts. 

 In my notes I have written that the sacculus is colorless, 

 but this would be such an unusual character for this struct- 

 ure, that it must be a mistake but refers to the involucrum. 



The two terminal filaments are of medium length and 

 arise on each side of the terminal vesicle. They are trans- 

 parent, flexible, scattered with nematocysts, sometimes re- 

 tracted into short, stumpy appendages. 



The terminal vesicle is ovoid, thin walled, colorless and 

 has a few nematocysts. 



The sexual bells, male and female, of A. Californica 

 were undeveloped. From this fact, as well as the small 

 size of the specimen, I am led to regard this as the young 

 or larval form, and that the adult was not seen by me. 



The genus Athorybia is a most interesting one in our 

 studies of the phylogeny of the Physophores. Especially 

 is this true of those forms related to Athorybia in which 

 we have but a single polypite, for they closely resemble 

 the young of such genera as Agalma, while several other 

 details of anatomy, which seem to characterize the adult 

 Athorybia, are found also in the larval Agalma. 



It is, of course, not impossible that the form A. Cali- 

 fornica is the young of a species, more like Diplorybia 

 formosa, and it may be true that all monogastric Athorybia- 

 like genera are larval forms of polygastric Anthophysidse. 



SPH^RONECTES GIGANTEA gen. et sp. nov. 



Up to the present time this interesting Calycophore has 

 not been found in American waters on the Atlantic or Pa- 

 cific coast. I have taken what may be its diphyozooid at 

 Newport, R. I. This diphyozooid of Sphoeronectes is fig- 



