132 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3 d Ser. 



both masculine and feminine, and -um for the neuter; e. g. 

 curo-troph-us (-os), masc. and fem., curo-troph-um 

 (-on), neut. ; dory-phorus, masc. and fem., dory-pho- 

 rum, neut.; disco-phorus, masc. and fem.; eu-pe ta- 

 lus, masc. and fem.; poly-stomus, masc. and fem., 

 -um, neut. The only exception I find given in the Latin 

 dictionary is di-somus, -a, -um; but that is erroneous 

 and should read disomus,- um. 



42 5. Family names formed from neuter names of genera 

 in -stoma, -soma, etc., should end in -atidae not in 

 -idae; for the stem of those words ends in -at, Greek -ar. 

 It is so in Latin (see p. 129) : e. g. dia-phragma , gen. 

 dia-phragmat-is , epi-gramma, gen. epi-gram- 

 matis, em-blema, gen. em-blemat-is , etc. 



43 Note. — The family name from forms in -stomatus, -a, 

 -um, would appear in the same form as that from -stoma, 

 -stomat-is. 



44 6. Family names formed from adjectives (used sub- 

 stantively) in -stomus or -s to mum, -somus or -sonum, 

 etc., end in -idae, not in -atidae. Thus Catostomus, 

 Catostomi dae . 



II. Adjectives. 



45 As a matter of course, this division will comprise by far 

 the largest part of all Greek compounds, but not by any 

 means all of them. Many of the compounds are genuine 

 nouns (see §§ 39-41), and all the adjectives may be used 

 as nouns. 



46 In forming compound adjectives from substantives (nouns, 

 adjectives and participles), it is not the familiar, nominative 

 singular form of the noun, adjective or participle that is 

 used, but the stem. 1 If the first element is a substantive 

 with a stem ending in a vowel and the second begins with a 

 vowel, the stem-vowel of the first element is, of course, 



] See S 5, with foot-note 1. 



