EXPLANATION OF I'LATES. 



I'LATE 1. 



Fig. 1. Verruca coral ioithila l'ils))r.v. Top view of type. C,r;irlna; F. Se., 

 fixed scutuiM ; F. T., lixed teryuiu ; Us. riKStrtuii. rai;('21. 



la. Verruca coraUopkila. Basal view. A. II., adtluctor rid;^e. 

 2, 4. Virruca coraUophila. Carinorostral views of two individuals, the 

 movable plates laekinj,'. 



3. Verruca coraliophila. Interior views of tixed terirniii and scutum. 

 5. ^'erruca coraliophila. Interior views of movable tergum and 



scutum. 



rj.ATK 2. 



Figs. l-\h. Verruca alha Pilsbry. I'ourtales Plateau, near Key West, Florida. 



Top, carinorostral and basal views. Page 25. 



2. Verruca alba. Basal view of a Blake specimen. 



3, 3a. Verruca alba barbadensi.'i I'ilsbry. Top and rostrocarinal views of 



the type. I'age 28. 



4. VeiTuca alba caribbea I'ilsbry. Colony on a sea-urchin spine. 



Page 28. 

 Platk 3. 



Figs. 1-lc. Verruca nexa, Darwin. Top, scutotergal, and carinorostral walls 



and base. Page 29. 



2. Verruca eugliipta Pilsljry. Interior view of rostrum. 



2a. Verruca cuf/lijpta Pilsbry. Interior view of fixed and movable 



scuta and terga. Page 39. 



Plate 4. 



Figs. 1-lc. Verruca floridana. Pilsbry. Top, base, rostrocarinal and scuto- 

 tergal walls. I'age 31. 



2. Verruca floridana. Movable plates of a more sculptured indi- 



vidual. 



3. Verruca floridana. Carinorostral view of an individual which sat 



transversely upon an echinoid spine. 



4. Vcrrt(ca calotheca Pilsl)ry. Basal view of type. Page 33. 

 4a, -ib. Verruca calotheca. Interior of movable scutum and tergum. 



Plate 5. 



Figs. 1, la. Verruca calotheca hctcropoma Pilsbry. Top and carinorostral 



walls of the type. • Page 35. 



2, 2a. Verruca calotheca fl.avidula Pilsbry. Carinal and top views of the 



type. F. '£., fixed tergum; M. T., movable tergum. Page 34. 



339 



