158 FLABELLIFERA • CORALLANIDAE 



Key to species of Alcirona 



1. Golden-brown setae starting dorsally on pereonite 3; pereopod 1, 



dactylus having several elongate spines insularis 



Golden-brown setae starting dorsally on pereonites 5 or 6; pereopod 1, 

 dactylus having accessory spine only krebsi 



Alcirona insularis Hansen, 1890 

 Figure 73A 



DIAGNOSIS 6 and 9, 5.0 mm. Posterior half of body, especially in 6 , bear- 

 ing stiff golden-brown setae, these beginning as posterior row on pereonite 3, 

 and becoming dense on posterior pereonites, pleonites and pleotelson. Per- 

 eopods 1-3, dactylus strongly falcate, having distal unguis equal in length to 

 rest of article, and with three or four strong teeth on posterior margin. Apex 

 of pleotelson rounded, bearing six short marginal spines in addition to setae. 



RECORDS Looe Key, Florida, 0.5-6 m; St. Thomas, U.S. Virgin Islands, 

 40-46 m; Puerto Rico, from intertidal coral rubble and from gills of nurse 

 shark Ginglymostoma sirratum; St. Lucia, from coral rubble. 



Alcirona krebsii Hansen, 1890 

 Figure 73B-D 



DIAGNOSIS 6 10 mm, ovigerous 9 15.5 mm. Posterior half of body, espe- 

 cially \nS bearing stiff golden-brown setae, these beginning in posterior row 

 on pereonites 5 or 6, becoming dense on posterior pereonites, pleonites, 

 uropods, and pleotelson. Pereopod 1, dactylus strongly falcate, with unguis 

 equal in length to rest of article, and with one strong tooth and several low 

 tubercles on posterior margin. Apex of pleotelson rounded, bearing six short 

 spines in addition to setae. 



RECORDS Bermuda, in sponges; Florida Keys; Quintana Roo, Yucatan 

 Peninsula; St. Thomas, U.S. Virgin Islands; Venezuela. 



REMARKS A single 8-mm 6 specimen of Alcirona from Panama Bay (Pa- 

 cific) has the characteristic pereopod 1 of ^4. krebsii, but has the rows of stiff 

 setae beginning on about pereonite 3. The possibility that A. krebsii is another 

 amphi-Panamic species needs to be investigated. 



