IV 



THE VOYAGE OF H.M.S. CHALLENGER. 

 *~ F O 



Ft. Frontal region. 

 Gr. Gastric region. 

 Or. Cardiac region. 

 Hr. Hepatic region. 

 Ggr. Antennal or green gland region. 



Fig. I. — Showing the nomenclature of the various parts. 



A-E. Cephalic somites. 

 F-0. Thoracic or pereionic somites. 

 P- V. Pleonic somites. 

 sod. Supraorbital tooth. 

 ad. First antennal tooth. 



Ophthalmus, . Eve. 



Ocellus, . . A little eye, distinct from the main organ of vision. 

 a. Ophthalmopod, The appendage that supports the main organ of vision ; it includes the eye, the peduncle, 



and the pedicle. Adapted from Podophthalmitus (Stimpson). 

 From /ieVara-ov, face, being that portion of the frontal surface in which the anternae are 



situated (Huxley). 

 Or antennule. 

 Fringe of hairs that surround the margin of the depression in 'which the eye lodges on the 



upper surface of the first joint of the first antenna ; from fi\e<t>apL<s, eyelash. 

 Appendage connected with the inner side of the first joint of first pair of antennae ; 



TrpocraLprrjfjia, appendage. 

 Style or large spine on outer margin of the first joint of the first pair of antennae; o-rrXos 

 and Kcpas. 



Metope, . . 



b. First antenna, 

 Blepharis, . 



pc. Prosartema, 



stc Stvlocerite, . 



c. Second antenna. 

 Sc. Scaphocerite, 

 Ph. Phymacerite, 



Ancecerite, 



ea. Epistoma, . . 



eg. Cheiloglossa, 



Scale-like appendage of the second pair of antennae (after Milne-Edwards). 



Tubercle at base of second antenna, containing external orifice of the green gland ; <£vfw, 

 tubercle, and /cepas. 



A curved process attached to the peduncle of the second pair of antenna? in Benthesicy- 

 m us ; from ayidj and Kcpas. 



Osseous portion of the metope that lies immediately in front of the oral aperture (Milne. 

 Edwards). 



Anterior lip. Membranous protuberance that lies in front of the mandibles and is con- 

 tinued under them ; x e ^os> lip, and y\wo<ra, tongue. 



