BURGESS: FOUR NKW SPECIES OF SQUID l-.Wori.OTh'lTIIIS 



short row of two or three photophores that bi- 

 furcates at the fork of the ventral arms; each 

 branch continues along the ventral aboral side of 

 arm IV to almost the tip. A row of closely set 

 photophores runs along the edge of the funnel 

 groove and divides near the apex of the groove 

 into two branches, each with photophores in 

 single file. The branches reunite near the base of 

 arm IV. The row continues distally along the 

 base of the tentacular sheath to the tip of the arm. 

 The third lateral row on the head begins anterior 

 to the first nuchal fold, has a gap at the window of 

 the eye, and then continues and splits into two 

 branches: A medial branch that continues ante- 

 riorly and ends near the base of arm IV at the 

 midline of the tentacular sheath and a lateral 

 branch that extends along the edge of the tentac- 

 ular sheath and terminates about the level of the 

 last hook on arm IV. The lateralmost row on the 

 head also starts at the first nuchal fold, continues 

 along the nuchal crest, and turns toward the 

 posterior eyelid where it runs along the ventral 

 edge to the optic sinus. The row begins again on 

 the dorsal edge of the optic sinus, continues along 

 the base of the swimming keel of arm III, and 

 stops at about three-fifths of the arm length. The 

 dorsal eyelid lacks photophores. 



There are nine irregularly spaced photophores 

 on the ventral part of the eyeball (Fig. 41). The 

 posteriormost light organ is larger than the 

 anteriormost which in turn is larger than the re- 

 maining seven light organs. The latter are 

 slightly different from each other in size and 

 shape. 



The teeth of the radula are long (lateralmost 

 teeth are longest), blunt, and slightly curved 

 (Fig. 4H). Of the seven teeth only the rachidian 

 tooth has small lateral cusps. 



The upper mandible of a small specimen (ML 

 30 mm) has distinct growth lines on the wings 

 (Fig. 4Gi). The riblike ridges on the gular plate 

 of the lower mandible are well developed (Fig. 

 4G 2 ). 



The gladius is feather-shaped. The rachis is 

 blunt anteriorly and forms a strong ridge 

 dorsally through its length. The vanes are 

 narrow, widest at about a third of the length of 

 the gladius. The posterior end is curved inward 

 ending in the cone. 



The largest female (ML 82 mm) is gravid; the 

 ovaries are distended and extend to the posterior 

 part of the mantle cavity. The eggs are opaque 

 and about 1 mm in diameter. 



None of the males have spermatophores. 



Young individuals: Immature individuals 

 (ML 11-22 mm) have relatively wider mantles 

 (MWI 45.5-57.0-72.1) than adults. At ML 11 mm 

 the arms have the following armature: 1 to 3 

 suckers proximally, 7 to 12 hooks, and 15 to 20 

 suckers distally. The tentacles are distinctly 

 longer than the mantle (TLI 172.7). The club has 

 three hooks along with nine biserial suckers 

 on the manus. Two of the suckers are slightly set 

 apart (future carpal suckers). Four rows of 

 minute suckers are located on the dactylus. At 

 ML 17 mm the arms have no proximal suckers, 

 12 to 18 hooks, and 19 to 21 distal suckers. The 

 club resembles that of the adult, except that two 

 marginal suckers are present on the dorsal distal 

 side of the manus and although there are already 

 four carpal suckers, the carpus is still not com- 

 pletely developed. The photophores on the 

 mantle are not distinctly arranged into rows, 

 except for two medialmost rows which are sep- 

 arated by a narrow space (Fig. 2D). The rows on 

 the head are each composed of photophores in 

 single file (Fig. 2F). The number and position of 

 the rows agree with those of the adult. 



Remarks: Adults of this species resemble 

 superficially E. chuni Ishikawa 1914 from 

 Japan, but they are easily distinguished by the 

 photophore pattern of the head and arms. 

 Enoploteuthis chuni has seven rows of photo- 

 phores on the head (including the rows passing 

 along the ventral eyelids) (pi. XX, fig. 1, Sasaki 

 1920), whereas jonesi has six rows. There is a 

 distinct midventral multiserial row on the head 

 of chuni, whereas the ventral midline of jonesi is 

 a clear space, except for two or three single 

 photophores near the fork of the ventral arms 

 anteriorly. Some rows of photophores on the head 

 divide and reunite in jonesi, a condition absent in 

 chuni. The row of photophores at the base of the 

 swimming keel of arm III reaches the tip of the 

 arm in chuni, but in jonesi, the same row ends 

 slightly beyond one-half to three-fifths of the arm 

 length. These observations were confirmed by T. 

 Okutani of the Tokai Regional Research 

 Laboratory (presently with the National Science 

 Museum, Tokyo) who kindly examined speci- 

 mens of E. chuni from Suruga Bay and com- 

 pared them with illustrations of E. jonesi sent to 

 him. In addition, there are more distal club 

 suckers in chuni (90) than in jonesi (64-72) and 

 these suckers are toothed in chuni and smooth in 

 jonesi. 



The counts and measurement of E. jonesi 



111 



