MARINE CRUSTACEANS. 691 
cervical groove, and the second, line ¢ of Boas, is Bouvier’s branchial groove, ordinarily known as 
the cervical groove; it would be well if these were known as the first and second cervical grooves); 
at the sides three transverse grooves slanting forwards, the first two being prolongations of the 
two cervical grooves and the third being line a of Boas; and two irregular longitudinal grooves, the 
upper, line d of Boas, connecting the first cervical groove with the fore edge below the antenna, 
and the second, line 6, 6’ of Boas, starting from the lower end of a@ and joining the lower ends 
of the two cervical grooves with the fore edge some way below the line d’ (see Fig. 125). 
(3) The abdomen long, straight, tapering somewhat from the second segment backwards, 
moderately broad, not greatly compressed but with pleura bent 
downwards and terga well arched. Both terga and pleura 
stout and overlapping. The telson pointed. 
(4) The eyes well developed and pigmented. The eye- 
stalks of moderate length, made up of two cylindrical joints, 
of which the second is longer than the first. 
(5) The first antenna with a straight stalk of three 
short, subequal subcylindrical joints, and two subequal flagella, 
which are longer than the stalk, but shorter than the flagellum 
of the second antenna. 
(6) The second antenna with the basal joint free, a scale 
which is broad but not leaf-like and ends in a sharp point 
that represents the tooth on the outer angle in the prawns, 
and a flagellum which is slender and about as long as the 
body. 
(7) ‘The mandible with a broad cutting edge, a small 
stump to represent the molar process, and a stout, curved, 
three-jointed palp. 
(8) The first maxilla with the plate which represents 
the basipodite broader than that which represents the coxo- 
podite, and the endopodite of a good size, and divided into 
two joints, the second of which is directed outwards. 
(9) The second maxilla with the coxopoditic and _basi- 
poditie plates both cleft, so that four lobes result, these lobes 
all narrow, and the scaphognathite ending behind in an angle, 
which is rather less than a right angle. 
(10) The first maxilliped with a many-jointed flagellum 
on the exopodite, a two-jointed endopodite which is not very 
broad and an epipodite. The basipoditic plate deep, but not 
broad. 

Fic. 125. Cephalothoracic carapace of Callia- 
nassa novaebritanniae from the left side, 
1. first cervical groove—the line e of Boas 
and ‘‘cervical groove” of Bouyier, 2. second 
cervical groove—the line ¢ of Boas and 
Bouvier’s ‘branchial groove,” ordinarily 
known as the ‘‘ cervical groove,” 1’ and 2’. 
continuations of 1 and 2 at the sides of 
the carapace, 3. upper longitudinal line— 
the linea thalassinica and perhaps also the 
linea homolica—the front part of which is the 
line d of Boas, 4. lower longitudinal line— 
the linea anomurica and perhaps also the 
linea dromiidica—the front part of which is 
the line b of Boas, 5. a soft area at the side 
of the carapace, 6, 6’. hard plates in this 
area, 7. rostrum, 8. thickened hinder edge of 
the carapace. The second cervical groove is 
here represented only by a line or crack in 
the carapace. It is, however, in the same 
place as the cervical groove of other Callia- 
nassas, and there is a good deal of evidence 
that a groove may be represented by a 
erack, The linea thalassinica, for instance, 
is sometimes a groove in part of its length. 
(11) The second mawilliped with the exopodite longer than the endopodite, carrying a jointed 
flagellum, and the endopodite slender, with the last joint at the end. 
1 A backward prolongation of the upper of these lines (d), 
known as the linea thalassinica, is found in many Thalas- 
sinidea, and a similar prolongation of the lower (b), known 
as the linea anomurica, in the Anomala, The linea homolica 
and linea dromiidica correspond in position with the first 
and second of these respectively, but as they are not con- 
tinuous with d and b it is doubtful how far they can be looked 
upon as homologous. 
loosely applied to the longitudinal suture of the Homolidae 
(as on p. 575 above) is wrong. 
In any case the term linea anomurica 
