228 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
Phoxus Holbolli Kriéyer. 
Gulf coast! (Stearns exped.). 
Acanthozone cuspidata Boeck (Lepechin) 
Gulf coast! (Stearns exped.). 
Acanthonotozoma serratum Boeck (O. Fabricius). 
Atlantic coast! (Stearns exped.). 
Acanthonotozoma inflatum Boeck (Kroyer). 
Gulf coast! (Stearns exped.). 
Cidiceros lynceus M. Sars. 
Monoculodes nubilatus Packard, Mem. Bost. Soc. Nat. Hist., i, p. 298, pl. 8, fig. 
4, 1867. 
Gulf coast! (Stearns exped., Packard); Atlantic coast! (Packard, 
Stearns exped.). 
Pleustes panoplus Bato (Kroyer). 
Amphithonotus cataphractus Packard, Mem. Bost. Soc. Nat. Hist., i, p. 298, 1867. 
Gulf coast! (Stearns exped.); Atlantic coast! (Packard). 
Pleustes bicuspis Boeck (Kroyer). 
A single specimen of this species was sent, with ‘“Atylus (Paramphitoe) 
inermis” (see Halirages fulvocinctus), to the Museum of Yale College by 
Packard. No special locality was given for the specimens, but they 
were most likely from Henley Harbor, as that is the only locality given 
by Packard for the “Atylus.” 
Pontcgenia inermis Boeck (Kroyer). 
Atylus vulgaris Packard, Mem. Bost. Soc. Nat. Hist., i, p. 298, 1867. 
Atlantic coast! (Packard). 
Halirages fulvocinctus Boeck (M. Sars). 
‘“‘Atylus (Paramphitoe [—thoe]) inermis (Kroyer, fide Boeck),” Packard, Mem. 
Bost. Soc. Nat. Hist., i, p. 298, pl. 8, figs. 3-3b, 1867. 
Atlantic coast! (Packard). 
The specimens sent to Europe and identified by Boeck as above 
quoted by Packard were undoubtedly Pontogenia inermis, but the spe- 
cies described and figured by Packard under the name given by Boeck 
is certainly distinet from that species. Two specimens which were evi- 
dently supposed by Packard to be the species described by him were 
sent to the Museum of Yale College under a manuscript name as a new 
species of Atylus: one of these specimens, as stated above, is Pleustes 
bicuspis, and is evidently not the species described and figured by 
Packard; the other specimen is Halirages fulvocinctus, and is, I think, 
the species described and figured by him. Packard describes his spe- 
cies as having “the first three abdominal segments produced into three 
strongly-hooked projections, the third of which is much the largest; 
