514 L'EronT OK THE OBDEI? STOMATOrODA—BTGELOVr. vol.xvii. 



the telson. Tlie wliole dorsal surface of the animal has a highly i)ol- 

 ished appearance that suggested the name which I have given to the 

 species. The rostrum is ovate, Avithout carinas, and it covers the first 

 antennary segment. The carapace has a polished surface and is devoid 

 of cariuce, except on the posterior lateral lobes, where the intermediate 

 and lateral carina^, are present. The posterior median tubercle is obso- 

 lete. The cervical suture is obliterated for some distance on each side 

 of the median line. The anterior lateral angles are short, acute spines. 

 The x^osterior lateral lobes arc evenly rounded. The distance between 

 the anterior lateral angles equals twice the length and exceeds half the 

 posterior width. The carapace differs from that of 8. armata chiefly in 

 the disappearance of the cervical suture on the median line and in the 

 small depressed anterior lateral i;pines. 



The exposed thoracic segments have no submedian carina^, but the 

 intermediate carinas are prominent. The ventral spine of the iifth seg- 

 ment is elongated, curved forward, and acute. The lateral process is 

 broadly flattened dorso-ventrally, slightly curved forward, and blunt. 

 The margins of the next two segments are broadly rounded and without 

 si^ines. Submedian cariujB are entirely absent in the abdomen, except 

 on the sixth somite. Intermediate lateral and marginal carinic are well 

 marked and end in spines, except in the first two abdominal somites, 

 where there are no spines. 



The telson (fig. S) is relatively smaller than in S. (IcsmarestU, and 

 is much wider- than long. There are 6 long and sharp marginal 



spines, each having at the base a slightly 

 raised carina; the spines of two outer pairs 

 curve somewhat toward the median line. The 

 submedian spines are jointed, and the mova- 

 ble distal part is longer than in *S'. (lesmarcstii. 

 The denticles are long and acute and extend 

 along the outer edge of each submedian spine 

 nearly to the joint. There are no anterior 

 lateral carinic. 



The crest has a sharp edge and rises rather 

 ^'^^■^- abruptly from the general surface. It is in- 



TELsoN OF sQuiLLA poLiTA. terruptcd by a depression near its anterior 



Three times natural s... ^^^^^^ ^ ^^^^^ j^.^ postcrlor cud Is exteudcd luto a 



long acute spine. The dorsal surface of the 

 telson is jDolished, as in S. desmarestii, but in this species thercare dis- 

 tinct symmetrically curved depressed lines and some shallow circular 

 pits, showing in a rudimentary condition the same sculi)turing found 

 in 8. mantis and its allies. The ventral surface is smooth except for 

 obsolete curved depressed lines and a long i^rominent heel. 



The eyes are of moderate size. The corneal portion, which is slightly 

 constricted in the middle, is about equal, not longer, than the interior 

 margin of the eye, and its long axis is at an angle of about 45° to the 



