1902.] 



NUDIBRANCHS FROM ZANZIBAR. 



69 



anatomy to be coriect, pai-ticularly as regards the absence of jaws. 

 They say : "In Jlelibe the buccal oi-gan is provided with neither 

 tongue, jaws, nor collar." Bergh, in his monograph on the genus 

 (in Malac. Untersuch. in Semper's Reisen, Th. ii. Bd. i. p. 363), 

 thinks this statement will pi-obably prove incorrect as other species 

 of Melihe are provided with jaws, and he gives as a generic 

 chaiacter: " Bulbus phaiyngeus cum mandibulis aliquantulum ut 

 in Phylliroidis: margo masticatoriusmandibulpefortiter dentatus." 



Text-fig. 5. 



Melihe, fimhr lata. 



a., anus. 

 div., diverticulum. 

 f.oe., folds of cesoplmgus. 



h., hood. 



I., lip. 



pyl.st., pyloric portion of stomach. 

 St., thin-walled stomach. 

 st.pl., belt of stomach-plates. 

 v., ventricle of heart. 



Mr. Crossland and I have, however, dissected several specimens 

 of Melihe Jimbriata, and in all failed to detect any trace of jaws. 

 Our drawing (text-fig. 5) will perhaps explain clearly the structure 

 of the digestive tract. In the centre and bottom of the hood is 

 a protruding, circular, fleshy lip. This leads straight into the 



