*> MAZATLAN BRYOZOA 



The wide, rounded or elliptical raised margin of the mouths 

 of the distant cells gives the polyzoarium of the present species 

 a very peculiar and well market aspect. It is of a brownish 

 hue, or white. 



Sab. Mazatlan ; on Imperator uuguis ; L'pool Col. 



Tablet 15 contains a group on Imperator. 16, a group de- 

 tached. 



SUBORDER II. CYCLOSTOMATA. 



FAMILY DISCOPORAD^E. Busk, fmsj 



GENUS DEFRANCIA, Bronn. 



13. DEFRANCIA INTRICATA, Busk, (n. s.) 



Disco valde irregulari ; irreg-ulariter radiatim costulato ; ori- 

 ficiis tubulorum, porisque inter stitialibus cequalibus magnitudine. 



Tlie small irregular patches appear to be constituted by the 

 confluence of several sets of costse with their corresponding 

 interstices, each set radiating from a depressed central point. 

 It differs from D. deformis Reuss, (L. c. p. 36, pi. 5, f. 24,) in 

 the uniform size of the openings of the tubes in the costse and 

 of the pores in the insterstices. 

 Hob. Mazatlan ; on Imperator unguis ; L'pool Col. 



Tablet 17 contains a group on Imperator. 



Besides the above, there occur on some of the shells, indica- 

 tions of other species, but in too imperfect a condition to allow 

 of their determination. Among these perhaps the best marked 

 is a species strongly resembling Cellepora pumicosa, Lin., a 

 species of Lepralia, and of Tubulipora. 



CLASS TUNICATA. 



Omnia adhuc ignota. 



