203 
On the Classification of the Crustacea Choristopoda 203 
attached to the front of the head, with the caudal stylets free ; the third 
a) has the antennz attached to the front of the head, with 
en. I 
the Cymothoide, the legs are all ancoral and the caudal stylets and 
branchiee are not ciliated ; in the ASgidz and Spheromide, only the two 
or — Lewin pairs of legs are ancoral, if neh and the caudal stylets 
and branchie: are commonly ciliated. A single genus of the Cymo- 
thoida ( (Zigathoa) has the habit of 4%ga and ciliated caudal stylets, Wee 
the antennze and ancoral legs of Cymothoa. This ciliation of the lam 
¥, 
in habit; one (gina) often parasitic, having the 6 anterior legs an- 
coral, the other (Cirolaning) not parasitic, ai with none of the legs 
ancoral.] 
Fam. I. CYMOTHOID:.* 
Maxillipedes breves, 3-4-articulati, operculiformes, a articulis termin- 
alibus angustis brevibus. Appendices caudales liberee, marginibus ra- 
rissimé ciliate. Antenne sub capite infixe. Abdomen 4-6- SHicdiatorh, 
segmentis anterioribus raro connatis. Pedes toti ancorales. Branchize 
sepissime non ciliate. Epimera conspicue. 
Subfam. 1. CYMOTHOIN &.—Lamelle caudales nude. Abdomen multiarticu- 
segmentis liberis, 
G. 1, Cymornoa, Fabr—Femora lata, eee ca latissima. Segmenta thoracis 2 
8ve posiica salto breviora nunquam latere acuté deg Segmentum cau- 
— sxpissimé valde transversum. aes ne graciles; Ime ad basin pavio 
rem 
G, 2. Crnarorno at Dane—Cymothoe affinis. Antenne Ime crasse basi con- 
G. 3. Lrvo ach—. ra latiuscula, 6ta vel 7 tis yix latiora, non an- 
gustiora. Segmenta thoracis 3tium 4tum 5Stum 6tumque fere equa, 7mum 
ulo br: Abdomen. thorace subito um. 
non involutus et in processum inter-antennalem conspicue non product 
Segmentum e iy pus spe oblique distortum.] 
G. 4. Antoora, Leach,—Femora a, posterio ora angustiora. Segmentum 
F angusta, 
_ thoracis You Stium dtumve Sto 6to 7move mulio brevius, Abdomen thorace 
subito wn Sptamen a processu laierali s spiniformi infra non instructis, 
ultimo vix tran 
Subgen. 1. Arnuoces—Ran appendicis caudalis multo pe 
Subgen. 2. Canorma, Leach—Rami saat 
G. 5. Neroctza, Leach—Femora et segmenta thoracis aint Aniloerd. Abdomen 
ae subito angustius, segmentis wee lateralt § 7 ormi infra instructis, 
transverso. 
eet a, Leach.—Femora latitudine seeBoitis.: Segmenta thoracis 3 pos- 
‘ica -a anterioribes non | longiora. Abdomen | thorace sul sabito, multo pew seg" 
oot OROZEUKYIN Al Segmentum abdominis posticum ac in Cymo- 
; Segmenta alia coalita 
kee 
Rect tes, Edw. 8, 24 47, 
cae ¥ Gentos Gon = et C. oes “hic i pertnat 
