129 
. barbata? L. station: — ? — 5 habitat: North- 
Bedforth; Jamaica; St. Thomas; d’Orb.! 
. Castanea Say. station: between sea-weed in coarse 
sand close to the shore; habitat: South-Carolina; Ja- 
maica; St. Thomas; Ad.! Florida; on a specimen in the 
Academy of N. Sc. in Philadelphia! Virgin-Isl.; Swift! 
St. Thomas; St. Croix; Tortola; Krebs! 
. litoralis? Say. station: — ? —; habitat: Virgin- 
Islands; Swift! 
. modiolus L. (Area L., M. citrinus polydentalus Ch., 
Tamarindiformis striatus Meusch., M. citrinus Bolt., M. 
sulcatus Lmk., M. exustus Gml., dOrb. non L., M. 
Chemnitzii Pot. & Mich., Brachydontes Sws.) station: 
on rocks above low-water-mark; habitat: Antillae; 
Mérch pg. 54! Guadeloupe; Beau pg. 22! Cuba; dOrb. ! 
Virgin-Islands; Swift! Krebs! 
Lithophagus Megerle v. Muehlfeld. 
bisuleatus d Orb. (Mod. appendiculatus Ph.) station: 
boring in life madrepores; habitat: Antillae; Moérch pg. 
56! Guadeloupe; Beau pg. 22! Cuba; Jamaica; Martini- 
que; Guadeloupe; St. Domingo; d’Orb.! Virgin-Islands ; 
Swift! Krebs! remark: Moll. de Cuba 2—833 pl. 28 
fig. 14—16; we are in possession of several very in- 
teresting specimens, where the animal has been obliged 
5—6 times to form concave bases to rest on to be able 
to keep communication with the sea and to prevent to 
be overgrown by the madrepores; they are conseqvently 
able to loose the byssus and to refasten it as they are 
moving upward; it will be understood that thereby is 
formed a wedgeformed ‘hole from the centre of the ma- 
drepore toward the surface as the animal of the Litho- 
