ADDENDA — 86. SERRANID.® HYPOPLECTRUS. 917 
836 (6). S. MBgrescens (Bloch &. Schu.) Goode & Beau. 
According to Dr. Holbrook the northern rei)resentative [nigrescens) of 
Serranus atrarius has the air-bladder simple, and the pectoral as long as 
the ventral; while in the southern form {atrarius) the air-bladder is sac- 
culated, and the pectoral longer than the ventral. These observations 
are confirmed by Dr. Bean, who has also noticed other points of differ- 
ence. The northern form (Cape Hatteras northward) may then stand 
as >S'. nigrescens. 
{Coryi)hmia nigrescens Bloch & Schneider, 1801, 297: Ccntropristis nigricans C. & V. 
iii, 37, and of various authors. ) 
Page 534. In Serranus trifurcus the filamentous tips to the dorsal 
spines are often but litfle develojted. A sjiecies, apparently the same, 
occurs in the Gulf of Mexico. Head 2|; depth 3f. D. X, 12; A. Ill, 
7 ; scales G-I8-13. The section called “ZfuZi/jemt” should he Frionodes* 
Jenyus. 
Page 535. To the account of Serranus suhligarius add: 
A large blotch of cream-color with sharply defined edges in front of 
vent, extending uiiwards as ^n irregular cross-band to near middle of 
sides; an interrupted black ring around tail at base of caudal; a large 
black blotch on front of soft dorsal; lower parts of head with a very 
conspicuous network of bluish streaks; pectorals, anal, and caudal, 
sharply barred with black ; veutrals tipped with black. Body deep, 
comjiressed; the head very slender, acuminate, the anterior profile 
straight or somewhat concave; depth at middle of eye little more than 
half-length of head; lower jaw little projecting; maxillary reaching 
posterior margin of pupil, 2^ in head; canines small, those on sides of 
lower jaw largest; edge of preopercle sharply and subequally serrate ; 
gill-rakers short. Dorsal little emarginate, the fourth spine 3 in head; 
caudal subtruucate; second anal spine longer than third, 2|- in head; 
jaws, and dorsal and anal fins scaleless. Head 21; depth 3; D. X, 13; 
A. HI, 7 ; scales 6-42-17. 
Pages 536, 537, etc. All the species of Serranus have normally 10 
spines in the dorsal. 
Page 536. Instead of snbgenus Plectroponia substitute : 
274 (&).— HYPOPtiECTRUS Gill. 
(Gill, Proc. Ac. Nat. Sci. Pliila. 1862, 236: type Plectropoma pucTla, C. & V.) 
This genus differs from Serranus chiefly in the presence of antrorse 
PnoJiodes Jenyus, Zool. Beagle. Fish. 1842,46: type Prio?iO(7es/asciat«s Jenyus. 
