ISOPODS OF THE ATLANTIC COAST— RICH ARD,^(jy. 517 



Family VT. CORALLANID.E. 



20. CORALLANA Dana. 



ANALYTICAL KEY TO THE 8PECIES OF CORALLANA. ^ 



a. Eyes moderate or large, some distance apart in the middle at the upper end. 

 h. Left mandible, seen in position, with the apical part profoundly trifid. Clypeus 

 and labrum very conspicuous. 

 ('. Basal article of the first pair of antennfe narrow, without spine. Head of male 

 ornamented with three horn-like tubercles. First segment of body not 



ornamented with tubercules 41. CoraUana trlcornh Hansen. 



c'. Basal joint of the first pair of antennae dilated, ornamented with spine at 

 inner exposed angle. Head of male ornamented with four horn-like 

 tubercles. First segment of body ornamented with two tubercles. 



42. CoraUana sexticornis, new species. 

 b\ Left mandible, seen in position, with the apical part obscurely trifid, or form- 

 ing a single apex. Labium and clypeus partly or very often entirely 

 covered by the mandibles, 

 c. Basal joint of the peduncle of the antennulye moderately narrow, seen from 

 below not prominent above the basal joints of the antennae. Last seg- 

 ment of the alidomen not ornamented with basal tubercles near the 



median line 43. CoraUana quadricornis Hansen. 



(/. Basal joint of the peduncle of the antennulae very much dilated, seen from 

 below so prominent that the basal joints of the antennee are placed in a 

 transverse cleft moderately deep between the antennulae and the mandi- 

 bles. Last segment of the body oi'namented with two large basal tuber- 

 cles situated near the median line. 

 (/. Fourth and fifth segments of the abdomen a little impressed in the dorsal 

 median line, not ornamented with carinee or tubercles. Last segment of 

 the abdomen with two spines at the apex. . 44. CoraUana subtilin Hansen. 

 d\ Fourth and fifth segments of the abdomen with a deep longitudinal exca- 

 vation in the dorsal median line, ornamented with many carina? and 

 tubercles. Last segment of the abdomen with four spines at the apex. 



45. CoraUana antiUensis Hansen. 

 a^. Eyes very large, contiguous in the middle of the head. 



b\ Last segment of the abdomen rather short, widely rounded posteriorly and with 

 a median excavation deep and moderately wide. 



46. CoraUana fisslcauda Hansen. 

 y. Last segment of the abdomen rather long, narrowly rounded posteriorly, with 



no excavation. 



('. Fourth and fifth segments of the abdomen deeply excavate longitudinally in 

 the dorsal median line and ornamented with carina\ Last segment of the 

 body with an incision in the middle of the side, and ornamented on the 

 dorsal surface with two densely setose areas and with two large basal 

 tubercles situated near the median line 47. CoraUana ocidata Hansen. 



c^. Fourth and fifth segments of the body very little impressed in the dorsal 

 median line, ornamented with no carinte. Last segment of the abdomen 

 entire at the sides, ornamented on the dorsal surface everywhere with very 

 short hairs remotely scattered 48. CoraUana warmingll Hansen. 



' This key, with the exception of the new species which is inserted, is taken entirely 

 from Hansen. Vidensk. Selsk. Skr., 6th ser., natur. og math., Afd. \ , 1890, pp. 378, 

 379. 



