254 The Molluscan Family Planorbidae 



PLATE 9 



Drepanotrema and Australorbis 



1-3. Drepanotrema anatinitm (Orbigny). From Viejo, Puerto Rico; from Dr. W. A. 

 Hoffman. 



1. Penial complex showing form of flagellum. 



2. Genitalia dissected and organs separated. Note the small number of ijrostate 



diverticula. 



3. Head and foot showing form of pseudobranch. 



4-10. Australorbis globratus (Say). From Lares, Puerto Rico; from Dr. W. A. Hoff- 

 man. 



4. Cross section of portion of ovotestis to show multiple branched diverticula. 



5. Distal end of verge showing opening at center. 



6. One diverticulum of prostate showing multiple branching at end. 



7. Pseudobranch and pneumostome. 



8. Outline of albumen gland showing depression occupied by intestine. 



9. Section of penial complex showing long and narrow verge and vergic sac. 



10. Entire genitalia dissected and organs separated. Note branched form of pros- 

 tate diverticula and multiple nature of ovotestis diverticula. 



Line near figure indicates 1 mm. in length. Line near 

 left of fig. 1 is also for fig. 3. 



