292 University of California Publications. [Zoology 



Observations on the method of formation of the loriea in 

 Cyttarocylis are not to be found in literature and I have been 

 unable to keep this species alive for prolonged examination in a 

 microaquarium. It seems probable from the form of the loriea 

 that this is built up from the terminal spine anteriorly, and that 

 the quadrangular expansion on the pedicel with its four spines 

 may in some way result from the presence of the four spiral 

 lines of cilia on the body of the animal which pass from the 

 adoral circlet toward the posterior end. They would form the 

 natural lines of transit of substances gathered by the adoral 

 circlet or extruded from the body and utilized in the forma- 

 tion of the loriea. The posterior ends of these lines of cilia may 

 be regions where the shell-forming substances gather in the form 

 of this quadrangular expansion with its more or less prominent 

 spines. Anterior to this region the spiral course of the cilia and 

 the greater freedom of movement on the part of the body of 

 the animal would tend to facilitate the more regular distribution 

 of the material and to bring about a transition from the quad- 

 rangular to the circular cross section of the shell. 



Dimensions. — Total length, 43G-450/x ; diameter of oral end, 

 90-100 |U; length of terminal spine, 35-50 /u.; diagonal diameter 

 at the expanded region of the pedicel, 12-18 /a. 



This species is found generally, though rarely in large num- 

 bers, in the summer plankton of the Pacific off San Diego. It 

 has been taken in vertical hauls from 185-35 fathoms to the 

 surface very generally, and less frequently in surface catches. It 

 appears to be a eupelagic species. 



Cyttarocylis pulchra sp. nov. 



PI. XXVIII. Figs. 19-23. 



This differs from the preceding in its proportions, in the 

 possession of one to three rings about the anterior part of the 

 loriea and in its very stout pedicel with a four-sided posterior 

 portion. The loriea is vase-shaped, being cylindrical in its 

 anterior third with a very slightly flaring mouth whose lip 

 diminishes to a sharp edge. This section of the loriea bears one, 

 or two, but more generally three external annulations which 



