MORPHOLOGICAL CHARACTERS 201 



which appears to be badly shrunken, is shown to have had a probable mantle length of 20-21 mm. 

 instead of 14 mm. On the other hand specimen No. 103, in which the subcutaneous gelatinous 

 tissues are clearly abnormally swollen, appears to have had a true mantle length of about 26 mm. as 

 compared with the observed value of 30 mm. In both these animals the corrected values are in better 

 agreement with the fin stage than the observed values. The posterior fin of specimen No. 101 is in 

 poor condition and was certainly longer than the 2-5 mm. recorded in Table 2; we may assume that 



Table 2. Morphological characters 



Left side in better preservation and measured instead of right. 



* The relationship between eye diameter (ED) and mantle length (ML) has been analysed by Pickford (1949 a, pp. 75-6). 

 The curve for adults was used for specimen No. 99, the curve for all stages was used for the two stage 4-5 specimens (Nos. 103 

 and 104), and the rest were taken from the curve for larvae. 



t The relationships between anterior fin length (FaL) and mantle length has been analysed by Pickford (1949a, pp. 51-3). 

 The adult curve was used for specimen No. 99, and the rest were determined from the curve for larvae. 



it was at least 60% of the length of the anterior fin. This would place the specimen in stage 3, but 

 even this would be inappropriate to a larva of only 14 mm. mantle length whereas a mantle length of 

 20-21 mm. is entirely to be expected at this stage. The correction for specimen No. 103 is less 

 striking since transitional specimens in the last stages of metamorphosis (stages 4-5) may range from 

 25 to 39 mm. in mantle length. 



Specimen No. 96 is too badly damaged for measurement but estimates from the eye diameter and 

 from anterior fin length indicate a probable mantle length of 24-5-27 mm. There is no trace of a posterior 



